Name: Addition - Number Fact Families A

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Strategy: Count On 1, Count Back 1, Difference of 1Related Fact FamiliesWhen learning number fact families for addition andsubtraction, there are four different facts: addition,addition turn-arounds and two related subtractionfacts.In this set the subtraction turn-arounds are the"count back 1" and "difference of one" facts.Students should become familiar with bothstrategies for these facts.

Use this number line to count on. Do not useyour fingers.E.g. Addition: Count On 1, Turn Around1) 8 1+ = 2) 1 8+ =

Subtraction: Count Back 1, Difference Of 13) 9 1– = 4) 9 8– =

Number Fact Family for 6 + 15) 6 1+ = 6) 1 6+ =

7) 7 1– = 8) 7 6– =

Number Fact Family for 4 + 19) 4 1+ = 10) 1 4+ =

11) 5 1– = 12) 5 4– =

Related Fact FamiliesComplete these Number Fact Families:13) 7 1+ = 14) 1 7+ =

15) 8 1– = 16) 9 8– =

_____–_____=___ _____–_____=___

17) 8 1+ = 18) 1 8+ =

_____+_____=___ _____+_____=___19) 4 1– = 20) 4 3– =

21) 5 1+ = 22) 1 5+ =

23) 8 1– = 24) 9 8– =

_____–_____=___ _____–_____=___

25) 10 1+ = 26) 1 10+ =

27) 8 1– = 28) 9 8– =

_____–_____=___ _____–_____=___

29) 8 1+ = 30) 1 8+ =

_____+_____=___ _____+_____=___31) 3 1– = 32) 3 2– =

Addition: Count on 1, Turn Arounds33) 8 1+ = 34) 1 7+ =35) 5 1+ = 36) 1 10+ =37) 9 1+ = 38) 1 2+ =39) 1 1+ = 40) 1 0+ =

Subtraction: Count Back 1, Difference of 141) 4 1– = 42) 5 4– =43) 10 9– = 44) 7 1– =45) 8 1– = 46) 11 10– =47) 6 5– = 48) 2 1– =

These worksheets are part of the Professor Pete's Gadgets: Number Facts eBook.

Name: Addition - Number Fact Families B

Licensed for unlimited copying by original purchaser only. www.professorpetesclassroom.com

Strategy: Count On 2, Count Back 2, Difference of 2Related Fact FamiliesWhen learning number fact families for addition andsubtraction, there are four different facts: addition,addition turn-arounds and two related subtractionfacts.In this set the subtraction turn-arounds are the"count back 2" and "difference of two" facts.Students should become familiar with bothstrategies for these facts.

E.g. Addition: Count On 2, Turn Around1) 9 2+ = 2) 2 9+ =

Subtraction: Count Back 2, Difference Of 23) 11 2– = 4) 11 9– =

Number Fact Family for 8+25) 8 2+ = 6) 2 8+ =

7) 10 2– = 8) 10 8– =

Number Fact Family for 5+29) 5 2+ = 10) 2 5+ =

11) 7 2– = 12) 7 5– =

Related Fact FamiliesComplete these Number Fact Families:13) 7 2+ = 14) 2 7+ =

15) 8 1– = 16) 9 8– =

_____–_____=___ _____–_____=___

17) 8 1+ = 18) 1 8+ =

_____+_____=___ _____+_____=___19) 8 2– = 20) 8 6– =

21) 4 2+ = 22) 2 4+ =

23) 8 1– = 24) 9 8– =

_____–_____=___ _____–_____=___

25) 10 2+ = 26) 2 10+ =

27) 8 1– = 28) 9 8– =

_____–_____=___ _____–_____=___

29) 8 1+ = 30) 1 8+ =

_____+_____=___ _____+_____=___31) 5 2– = 32) 5 3– =

Addition: Count on 2, Turn Arounds33) 2 2+ = 37) 2 4+ =34) 0 2+ = 38) 2 10+ =35) 1 2+ = 39) 2 3+ =36) 6 2+ = 40) 2 5+ =

Subtraction: Count Back 2, Difference of 241) 2 2– = 45) 8 6– =42) 11 9– = 46) 9 2– =43) 5 2– = 47) 6 4– =44) 10 8– = 48) 10 2– =

These worksheets are part of the Professor Pete's Gadgets: Number Facts eBook.

Name: Addition - Number Fact Families C

Licensed for unlimited copying by original purchaser only. www.professorpetesclassroom.com

Strategy: Count On 3, Count Back 3, Difference of 3Related Fact FamiliesWhen learning number fact families for addition andsubtraction, there are four different facts: addition,addition turn-arounds and two related subtractionfacts.In this set the subtraction turn-arounds are the"count back 3" and "difference of three" facts.Students should become familiar with bothstrategies for these facts.

E.g. Addition: Count On 3, Turn Around1) 6 3+ = 2) 3 6+ =

Subtraction: Count Back 3, Difference Of 33) 9 3– = 4) 9 6– =

Number Fact Family for 7+35) 7 3+ = 6) 3 7+ =

7) 10 3– = 8) 10 7– =

Number Fact Family for 5+39) 5 3+ = 10) 3 5+ =

11) 8 3– = 12) 8 5– =

Related Fact FamiliesComplete these Number Fact Families:13) 9 3+ = 14) 3 9+ =

15) 8 1– = 16) 9 8– =

_____–_____=___ _____–_____=___

17) 8 1+ = 18) 1 8+ =

_____+_____=___ _____+_____=___19) 11 3– = 20) 11 8– =

21) 4 3+ = 22) 3 4+ =

23) 8 1– = 24) 9 8– =

_____–_____=___ _____–_____=___

25) 10 3+ = 26) 3 10+ =

27) 8 1– = 28) 9 8– =

_____–_____=___ _____–_____=___

29) 8 1+ = 30) 1 8+ =

_____+_____=___ _____+_____=___31) 5 3– = 32) 5 2– =

Addition: Count on 3, Turn Arounds33) 7 3+ = 37) 3 3+ =34) 0 3+ = 38) 3 10+ =35) 4 3+ = 39) 3 9+ =36) 5 3+ = 40) 3 1+ =

Subtraction: Count Back 3, Difference of 341) 4 3– = 45) 10 7– =42) 7 4– = 46) 9 3– =43) 5 3– = 47) 6 3– =44) 8 5– = 48) 12 3– =

These worksheets are part of the Professor Pete's Gadgets: Number Facts eBook.

Name: Addition - Number Fact Families D

Licensed for unlimited copying by original purchaser only. www.professorpetesclassroom.com

Strategy: Rainbow Facts, Pairs to 10Rainbow Facts or Pairs to 10 are best learnt with aten frame. Using counters to show the number andanother set of counters (or the missing counters) toshow the matching pair is an exellent way to helpstudents visualise these facts.

Use this ten frame with counters to complete thequestions below.

This ten frame shows 6 + 4 using only one set ofcounters. A second set of counters can be used ifpreferred to establish this useful set of facts.

A rainbow is a bright and cheerfulillustration of the pairs that add to equal10.

Complete the number facts that add to 10.There are only 6 of them because all theothers are turn arounds.1) 2 + 8 = 10 4) 5 + 5 = 10

2) 4 + 6 = 10 5) 1 + 9 = 10

3) 3 + 7 = 10 6) 0 + 10 = 10

Write their matching Turn Around facts here.

7) 7 + 3 = 10 10) 9 + 1 = 10

8) 8 + 2 = 10 11) 6 + 4 = 10

9) 10 + 0 = 10 12) 5 + 5 = 10

Related Subtraction Fact FamiliesComplete the related Subtraction Fact Families:13) 10 – 7 = 3 17) 10 – 1 = 9

14) 10 – 8 = 2 18) 10 – 3 = 7

15) 10 – 5 = 5 19) 10 – 2 = 8

16) 10 – 0 = 10 20) 10 – 6 = 4

Complete these Number Fact Families:21) 4 6+ = 22) 6 4+ =

23) 8 1– = 24) 9 8– =

_____–_____=___ _____–_____=___25) 8 1+ = 26) 1 8+ =

_____+_____=___ _____+_____=___27) 10 7– = 28) 10 3– =

These worksheets are part of the Professor Pete's Gadgets: Number Facts eBook.

Name: Addition - Number Fact Families E

Licensed for unlimited copying by original purchaser only. www.professorpetesclassroom.com

Strategy: Rainbow Facts, Pairs to 10Each Rainbow fact has a related family of facts: "Addition" and its "Turn Around", "Subtraction" and its"Turn Around".

Look at the addition grid on the left.Highlight all the 10s in the answers. Then look ateach pair of numbers that add to make that 10.E.g. Addition: Count On 3, Turn Around1) 6 4+ = 2) 4 6+ =

Subtraction: Count Back 3, Difference Of 33) 10 6– = 4) 10 4– =

Write the Fact Family to match each of the other10 sums below.

Number Fact Family for 7 + 35) 7 3+ = 6) 3 7+ =

7) 10 3– = 8) 10 7– =

Number Fact Family for 5 + 59) 5 5+ = 10) 5 5+ =

11) 10 5– = 12) 10 5– =

Complete these Number Fact Families:13) 8 2+ = 14) 2 8+ =

15) 8 1– = 16) 9 8– =

_____–_____=___ _____–_____=___

17) 8 1+ = 18) 1 8+ =

_____+_____=___ _____+_____=___19) 10 1– = 20) 10 9– =

21) 10 0+ = 22) 0 10+ =

23) 8 1– = 24) 9 8– =

_____–_____=___ _____–_____=___

Complete the number facts that add to 10:25) 2 + 8 = 10 26) 5 + 5 = 10

27) 4 + 6 = 10 28) 1 + 9 = 10

29) 3 + 7 = 10 30) 0 + 10 = 10

These worksheets are part of the Professor Pete's Gadgets: Number Facts eBook.

Name: Addition - Number Fact Families F

Licensed for unlimited copying by original purchaser only. www.professorpetesclassroom.com

Strategy: +0 Nothing at All! +10 Place Value+ 0 Think of adding nothing at all.+ 10 Adding ten to a single digit number results inthe associated teen number which has one ten andthe single digit in ones (e.g. "six" becomes"sixteen").

1) 6 10+ = 2) 10 6+ =

3) 6 1– = 4) 6 5– =

Related Fact FamiliesComplete these Number Fact Families:5) 10 5+ = 6) 5 10+ =

7) 8 1– = 8) 9 8– =

_____–_____=___ _____–_____=___

9) 3 0+ = 10) 0 3+ =

11) 3 0– = 12) 3 3– =

13) 8 1+ = 14) 1 8+ =

_____+_____=___ _____+_____=___15) 18 10– = 16) 18 8– =

17) 8 1+ = 18) 1 8+ =

_____+_____=___ _____+_____=___19) 9 0– = 20) 9 9– =

21) 8 1+ = 22) 1 8+ =

_____+_____=___ _____+_____=___

23) 17 10– = 24) 17 7– =

25) 2 0+ = 26) 0 2+ =

27) 8 1– = 28) 9 8– =

_____–_____=___ _____–_____=___

Addition: + 0, + 1029) 9 0+ = 35) 10 5+ =30) 9 10+ = 36) 10 6+ =31) 8 10+ = 37) 0 8+ =32) 2 0+ = 38) 0 8+ =33) 7 0+ = 39) 0 0+ =34) 4 10+ = 40) 0 10+ =

Subtraction: – 0, – 1041) 13 – 10 = 3 47) 5 – 0 = 542) 17 – 10 = 7 48) 16 – 6 = 1043) 4 – 4 = 0 49) 11 – 10 = 144) 10 – 10 = 0 50) 20 – 10 = 1045) 2 – 0 = 2 51) 9 – 9 = 046) 18 – 10 = 8 52) 19 – 9 = 10

These worksheets are part of the Professor Pete's Gadgets: Number Facts eBook.

Name: Addition - Number Fact Families A

Licensed for unlimited copying by original purchaser only. www.professorpetesclassroom.com

Strategy: Count On 1, Count Back 1, Difference of 1Related Fact FamiliesWhen learning number fact families for addition andsubtraction, there are four different facts: addition,addition turn-arounds and two related subtractionfacts.In this set the subtraction turn-arounds are the"count back 1" and "difference of one" facts.Students should become familiar with bothstrategies for these facts.

Use this number line to count on. Do not useyour fingers.E.g. Addition: Count On 1, Turn Around1) 8 1+ = 9 2) 1 8+ = 9

Subtraction: Count Back 1, Difference Of 13) 9 1– = 8 4) 9 8– = 1

Number Fact Family for 6 + 15) 6 1+ = 7 6) 1 6+ = 7

7) 7 1– = 6 8) 7 6– = 1

Number Fact Family for 4 + 19) 4 1+ = 5 10) 1 4+ = 5

11) 5 1– = 4 12) 5 4– = 1

Related Fact FamiliesComplete these Number Fact Families:13) 7 1+ = 8 14) 1 7+ = 8

15) 8 1– = 7 16) 8 7– = 1

17) 3 1+ = 4 18) 1 3+ = 4

19) 4 1– = 3 20) 4 3– = 1

21) 5 1+ = 6 22) 1 5+ = 6

23) 6 1– = 5 24) 6 5– = 1

25) 10 1+ = 11 26) 1 10+ = 11

27) 11 1– = 10 28) 11 10– = 1

29) 2 1+ = 3 30) 1 2+ = 3

31) 3 1– = 2 32) 3 2– = 1

Addition: Count on 1, Turn Arounds33) 8 1+ = 9 34) 1 7+ = 835) 5 1+ = 6 36) 1 10+ = 1137) 9 1+ = 10 38) 1 2+ = 339) 1 1+ = 2 40) 1 0+ = 1

Subtraction: Count Back 1, Difference of 141) 4 1– = 3 42) 5 4– = 143) 10 9– = 1 44) 7 1– = 645) 8 1– = 7 46) 11 10– = 147) 6 5– = 1 48) 2 1– = 1

These worksheets are part of the Professor Pete's Gadgets: Number Facts eBook.

ANSWERS

Name: Addition - Number Fact Families B

Licensed for unlimited copying by original purchaser only. www.professorpetesclassroom.com

Strategy: Count On 2, Count Back 2, Difference of 2Related Fact FamiliesWhen learning number fact families for addition andsubtraction, there are four different facts: addition,addition turn-arounds and two related subtractionfacts.In this set the subtraction turn-arounds are the"count back 2" and "difference of two" facts.Students should become familiar with bothstrategies for these facts.

E.g. Addition: Count On 1, Turn Around1) 9 2+ = 11 2) 2 9+ = 11

Subtraction: Count Back 1, Difference Of 13) 11 2– = 9 4) 11 9– = 2

Number Fact Family for 8+25) 8 2+ = 10 6) 2 8+ = 10

7) 10 2– = 8 8) 10 8– = 2

Number Fact Family for 5+29) 5 2+ = 7 10) 2 5+ = 7

11) 7 2– = 5 12) 7 5– = 2

Related Fact FamiliesComplete these Number Fact Families:13) 7 2+ = 9 14) 2 7+ = 9

15) 9 2– = 7 16) 9 7– = 2

17) 6 2+ = 8 18) 2 6+ = 8

19) 8 2– = 6 20) 8 6– = 2

21) 4 2+ = 6 22) 2 4+ = 6

23) 6 2– = 4 24) 6 4– = 2

25) 10 2+ = 12 26) 2 10+ = 12

27) 12 2– = 10 28) 12 10– = 2

29) 3 2+ = 5 30) 2 3+ = 5

31) 5 2– = 3 32) 5 3– = 2

Addition: Count on 2, Turn Arounds33) 2 2+ = 4 37) 2 4+ = 634) 0 2+ = 2 38) 2 10+ = 1235) 1 2+ = 3 39) 2 3+ = 536) 6 2+ = 8 40) 2 5+ = 7

Subtraction: Count Back 2, Difference of 241) 2 2– = 0 45) 8 6– = 242) 11 9– = 2 46) 9 2– = 743) 5 2– = 3 47) 6 4– = 244) 10 8– = 2 48) 10 2– = 8

These worksheets are part of the Professor Pete's Gadgets: Number Facts eBook.

ANSWERS

Name: Addition - Number Fact Families C

Licensed for unlimited copying by original purchaser only. www.professorpetesclassroom.com

Strategy: Count On 3, Count Back 3, Difference of 3Related Fact FamiliesWhen learning number fact families for addition andsubtraction, there are four different facts: addition,addition turn-arounds and two related subtractionfacts.In this set the subtraction turn-arounds are the"count back 3" and "difference of three" facts.Students should become familiar with bothstrategies for these facts.

E.g. Addition: Count On 1, Turn Around1) 6 3+ = 9 2) 3 6+ = 9

Subtraction: Count Back 1, Difference Of 13) 9 3– = 6 4) 9 6– = 3

Number Fact Family for 7+35) 7 3+ = 10 6) 3 7+ = 10

7) 10 3– = 7 8) 10 7– = 3

Number Fact Family for 5+39) 5 3+ = 8 10) 3 5+ = 8

11) 8 3– = 5 12) 8 5– = 3

Related Fact FamiliesComplete these Number Fact Families:13) 9 3+ = 12 14) 3 9+ = 12

15) 12 3– = 9 16) 12 9– = 3

17) 8 3+ = 11 18) 3 8+ = 11

19) 11 3– = 8 20) 11 8– = 3

21) 4 3+ = 7 22) 3 4+ = 7

23) 7 3– = 4 24) 7 4– = 3

25) 10 3+ = 13 26) 3 10+ = 13

27) 13 3– = 10 28) 13 10– = 3

29) 2 3+ = 5 30) 2 3+ = 5

31) 5 3– = 2 32) 5 2– = 3

Addition: Count on 3, Turn Arounds33) 7 3+ = 10 37) 3 3+ = 634) 0 3+ = 3 38) 3 10+ = 1335) 4 3+ = 7 39) 3 9+ = 1236) 5 3+ = 8 40) 3 1+ = 4

Subtraction: Count Back 3, Difference of 341) 4 3– = 1 45) 10 7– = 342) 7 4– = 3 46) 9 3– = 643) 5 3– = 2 47) 6 3– = 344) 8 5– = 3 48) 12 3– = 9

These worksheets are part of the Professor Pete's Gadgets: Number Facts eBook.

ANSWERS

Name: Addition - Number Fact Families D

Licensed for unlimited copying by original purchaser only. www.professorpetesclassroom.com

Strategy: Rainbow Facts, Pairs to 10Rainbow Facts or Pairs to 10 are best learnt with aten frame. Using counters to show the number andanother set of counters (or the missing counters) toshow the matching pair is an exellent way to helpstudents visualise these facts.

Use this ten frame with counters to complete thequestions below.

This ten frame shows 6 + 4 using only one set ofcounters. A second set of counters can be used ifpreferred to establish this useful set of facts.

A rainbow is a bright and cheerfulillustration of the pairs that add to equal 10.

Complete the number facts that add to 10.There are only 6 of them because all theothers are turn arounds.1) 2 + 8 = 10 4) 5 + 5 = 10

2) 4 + 6 = 10 5) 1 + 9 = 10

3) 3 + 7 = 10 6) 0 + 10 = 10

Write their matching Turn Around facts here.

7) 7 + 3 = 10 10) 9 + 1 = 10

8) 8 + 2 = 10 11) 6 + 4 = 10

9) 10 + 0 = 10 12) 5 + 5 = 10

Related Subtraction Fact FamiliesComplete the related Subtraction Fact Families:13) 10 – 7 = 3 17) 10 – 1 = 9

14) 10 – 8 = 2 18) 10 – 3 = 7

15) 10 – 5 = 5 19) 10 – 2 = 8

16) 10 – 0 = 10 20) 10 – 6 = 4

Complete these Number Fact Families:21) 4 6+ = 10 22) 6 4+ = 10

23) 10 4– = 6 24) 10 6– = 4

25) 3 7+ = 10 26) 7 3+ = 10

27) 10 7– = 3 28) 3 7– = -4

These worksheets are part of the Professor Pete's Gadgets: Number Facts eBook.

ANSWERS

Name: Addition - Number Fact Families E

Licensed for unlimited copying by original purchaser only. www.professorpetesclassroom.com

Strategy: Rainbow Facts, Pairs to 10Each Rainbow fact has a related family of facts: "Addition" and its "Turn Around", "Subtraction" and its"Turn Around".

Look at the addition grid on the left.Highlight all the 10s in the answers. Then look ateach pair of numbers that add to make that 10.E.g. Addition: Count On 3, Turn Around1) 6 4+ = 10 2) 4 6+ = 10

Subtraction: Count Back 3, Difference Of 33) 10 6– = 4 4) 10 4– = 6

Write the Fact Family to match each of the other10 sums below.

Number Fact Family for 7 + 35) 7 3+ = 10 6) 3 7+ = 10

7) 10 3– = 7 8) 10 7– = 3

Number Fact Family for 5 + 59) 5 5+ = 10 10) 5 5+ = 10

11) 10 5– = 5 12) 10 5– = 5

Complete these Number Fact Families:13) 8 2+ = 10 14) 2 8+ = 10

15) 10 8– = 2 16) 10 2– = 8

17) 9 1+ = 10 18) 1 9+ = 10

19) 10 1– = 9 20) 10 9– = 1

21) 10 0+ = 10 22) 0 10+ = 10

23) 10 0– = 10 24) 10 10– = 0

Complete the number facts that add to 10.25) 2 + 8 = 10 28) 5 + 5 = 10

26) 4 + 6 = 10 29) 1 + 9 = 10

27) 3 + 7 = 10 30) 0 + 10 = 10

These worksheets are part of the Professor Pete's Gadgets: Number Facts eBook.

ANSWERS

Name: Addition - Number Fact Families F

Licensed for unlimited copying by original purchaser only. www.professorpetesclassroom.com

Strategy: +0 Nothing at All! +10 Place Value+ 0 Think of adding nothing at all.+ 10 Adding ten to a single digit number results inthe associated teen number which has one ten andthe single digit in ones (e.g. "six" becomes"sixteen").

1) 6 10+ = 16 2) 10 6+ = 16

3) 6 1– = 5 4) 6 5– = 1

Related Fact FamiliesComplete these Number Fact Families:5) 10 5+ = 15 6) 5 10+ = 15

7) 15 5– = 10 8) 15 10– = 5

9) 3 0+ = 3 10) 0 3+ = 3

11) 3 0– = 3 12) 3 3– = 0

13) 8 10+ = 18 14) 10 8+ = 18

15) 18 10– = 8 16) 18 8– = 10

17) 9 0+ = 9 18) 0 9+ = 9

19) 9 0– = 9 20) 9 9– = 0

21) 7 10+ = 17 22) 10 7+ = 17

23) 17 10– = 7 24) 17 7– = 10

25) 2 0+ = 2 26) 0 2+ = 2

27) 2 0– = 2 28) 2 2– = 0

Addition: + 0, + 1029) 9 0+ = 9 35) 10 5+ = 1530) 9 10+ = 19 36) 10 6+ = 1631) 8 10+ = 18 37) 0 8+ = 832) 2 0+ = 2 38) 0 8+ = 833) 7 0+ = 7 39) 0 0+ = 034) 4 10+ = 14 40) 0 10+ = 10

Subtraction: – 0, – 1041) 13 – 10 = 3 47) 5 – 0 = 542) 17 – 10 = 7 48) 16 – 10 = 643) 4 – 0 = 4 49) 11 – 10 = 144) 10 – 10 = 0 50) 20 – 10 = 1045) 2 – 0 = 2 51) 9 – 0 = 946) 18 – 10 = 8 52) 19 – 10 = 9

These worksheets are part of the Professor Pete's Gadgets: Number Facts eBook.

ANSWERS