Adding decimals within 1

1 Workouttheadditions.

Usethenumberlinestohelpyou.

a) 0.3+0.2=

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

b) 0.1+0.4=

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

c) 0.2+0.1+0.2=

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Whatdoyounoticeaboutyouranswers?

2 Completethepart-wholemodels.

a) c)

b) d)

3 Completetheadditions.

Usetheplacevaluechartstohelpyou.

a) 0.42+0.3=

b) 0.28+0.32=

©WhiteRoseMaths2020

0.1 0.3 0.5

0.4

0.7 0.2 0.05 0.0050.5

Ones Tenths Hundredths

Ones Tenths Hundredths

0 4 0 2

+ 0 0 3

©WhiteRoseMaths2020

c) 0.28+0.36=

4 Usethecolumnmethodtoworkouttheadditions.

a) d)

b) e)

c) f)

5 Jackhassetupacolumnaddition

toworkout0.19+0.07

WhatmistakehasJackmade?

6 Workout7hundredths+34hundredths.

Giveyouranswerasadecimal.

7hundredths+34hundredths=

7 Evadrinksaquarterofalitreofwater.

Modrinks0.3litresofwater.

WhitneydrinksatenthofalitremorewaterthanMo.

HowmuchwaterdoEva,MoandWhitney

drinkaltogether?

0 4 2

+ 0 3

0 4 2

+ 0 0 3 3

0 0 4

+ 0 3 3

0 4 3 6

+ 0 1 7

0 7 5 1

+ 0 0 9

0 1 9

+ 0 7

Ones Tenths Hundredths

Water