M203 – Math Olympiad Level 3Mental Math Practice Deck 1

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Guided Practice Questions

Attempt each question in 10 seconds or less, then view the following slide for the correct answer.

6 + 3 + 5 + 7 =

Practice 1

(3 + 7) + 6 + 5 =

21

Practice 1

Practice 2

2 + 9 + 3 + 8 =

(2 + 8) + 9 + 3 =

22

Practice 2

Practice 3

6 + 7 + 9 + 1 + 4 =

(6 + 4) + (9 + 1) + 7 =

27

Practice 3

Practice 4

8 + 1 + 5 + 1 + 5 =

(5 + 5) + (8 + 1 + 1) =

20

Practice 4

Practice 5

4 + 7 + 2 + 6 + 3 =

(4 + 6) + (7 + 3) + 2 =

22

Practice 5

Practice 6

6 + 9 + 2 + 1 + 5 + 3 =

(9 + 1) + (2 + 5 + 3) + 6 =

26

Practice 6

Practice 7

4 + 3 + 8 + 9 + 2 + 7 =

(3 + 7) + (8 + 2) + 4 + 9 =

33

Practice 7

Practice 8

5 + 1 + 7 + 4 + 8 =

(5 + 1 + 4) + 7 + 8 =

25

Practice 8

Practice 9

1 + 6 + 8 + 9 + 4 =

(1 + 9) + (6 + 4) + 8 =

28

Practice 9

Practice 10

8 + 1 + 7 + 2 + 2 =

(8 + 2) + (7 + 1 + 2) =

20

Practice 10

Practice 11

92 + 57 + 8 + 43 =

(92 + 8) + (57 + 43) =

200

Practice 11

Practice 12

86 + 24 + 14 + 26 =

(86 + 14) + 24 + 26=

250

Practice 12

Practice 13

35 + 78 + 65 =

(35 + 65) + 78 =

178

Practice 13

Practice 14

27 + 74 + 73 + 26 =

(27 + 73) + (74 + 26) =

200

Practice 14

Practice 15

35 + 45 + 55 + 65 =

(35 + 65) + (45 + 55) =

200

Practice 15

Practice 16

17 + 46 + 93 + 54 =

(46 + 54) + 93 + 17 =

210

Practice 16

Practice 17

74 + 18 + 21 + 82 =

(18 + 82) + 74 + 21=

195

Practice 17

Practice 18

9 + 11 + 23 + 77 + 91 =

(9 + 91) + (23 + 77) + 11 =

211

Practice 18

Practice 19

38 + 62 + 67 + 36 =

(38 + 62) + 67 + 36 =

203

Practice 19

Practice 20

98 + 12 + 1 + 88 + 1=

(98 + 1 + 1) + (12 + 88) =

200

Practice 20

Practice 21

1 + 3 + 5 + 5 + 7 =

(3 + 7) + (5 + 5) + 1 =

21

Practice 21

Practice 22

1 + 6 + 3 + 9 + 4 =

(1 + 9) + (6 + 4) + 3 =

23

Practice 22

Practice 23

96 + 87 + 12 + 4 =

(96 + 4) + 87 + 12 =

199

Practice 23

Practice 24

7 + 2 + 5 + 8 =

(2 + 8) + 7 + 5 =

22

Practice 24

Practice 25

19 + 78 + 22 + 81 + 29 =

(19 + 81) + (78 + 22) + 29 =

229

Practice 25

Practice 26

5 + 34 + 4 + 66 + 3 =

(34 + 66) + 5 + 4 + 3 =

112

Practice 26

Practice 27

83 + 43 + 27 + 57 =

(43 + 57) + 83 + 27 =

210

Practice 27

Practice 28

7 + 23 + 77 + 33 =

(23 + 77) + 7 + 33 =

140

Practice 28

Practice 29

4 + 5 + 6 + 2 + 7 =

(4 + 6) + 5 + 2 + 7 =

24

Practice 29

Practice 30

16 + 92 + 6 + 84 =

(16 + 84) + 92 + 6 =

198

Practice 30

Practice 31

8 + 6 + 1 + 42 + 4 =

(8 + 42) + (6 + 4) + 1 =

61

Practice 31

Practice 32

19 + 5 + 11 + 5 =

(19 + 11) + (5 + 5) =

40

Practice 32

Practice 33

39 + 45 + 61 + 5 + 50 =

(39 + 61) + (45 + 5 + 50) =

200

Practice 33

Practice 34

93 + 18 + 3 + 22 + 4 =

(93 + 3 + 4) + 18 + 22 =

140

Practice 34

Practice 35

1 + 4 + 7 + 9 + 3 + 5 =

(1 + 9) + (7 + 3) + 4 + 5 =

29

Practice 35

Practice 36

47 + 19 + 31 + 53 =

(47 + 53) + 19 + 31 =

150

Practice 36

Practice 37

27 + 60 + 45 + 13 =

(27 + 60 + 13) + 45 =

145

Practice 37

Practice 38

8 + 5 + 4 + 5 + 6 + 1 =

(5 + 5) + (4 + 6) + 8 + 1 =

29

Practice 38

Practice 39

23 + 34 + 66 + 77 =

(23 + 77) + (34 + 66) =

200

Practice 39

Practice 40

1 + 8 + 7 + 1 + 4 =

(1 + 8 + 1) + 7 + 4 =

21

Practice 40

Practice 41

15 + 9 + 5 + 11 + 7 =

(15 + 5) + (9 + 11) + 7 =

47

Practice 41

Practice 42

8 + 13 + 9 + 2 + 7 =

(8 + 2) + (13 + 7) + 9 =

39

Practice 42

Practice 43

6 + 11 + 3 + 14 + 9 =

(6 + 14) + (11 + 9) + 3 =

43

Practice 43

Practice 44

98 + 7 + 1 + 3 + 2 =

(98 + 2) + (7 + 3) + 1 =

111

Practice 44

Practice 45

1 + 7 + 2 + 5 + 6 + 5 =

(1 + 7 + 2) + (5 + 5) + 6 =

26

Practice 45

Mental Math Self-Quiz

On a separate sheet of paper record your answers to the following 10 questions. Then

check your answers with the slide that follows.

Quiz Question 1

1 + 3 + 5 + 7 + 9 =

Quiz Question 2

6 + 3 + 7 + 4 + 8 =

Quiz Question 3

1 + 5 + 4 + 8 + 1 + 2 =

Quiz Question 4

21 + 82 + 79 + 18 =

Quiz Question 5

34 + 46 + 54 + 66 =

Quiz Question 6

92 + 47 + 8 + 12 + 53 =

Quiz Question 7

9 + 27 + 91 + 25 + 73 =

Quiz Question 8

8 + 2 + 1 + 7 + 9 + 5 =

Quiz Question 9

14 + 90 + 1 + 86 + 7 =

Quiz Question 10

32 + 64 + 3 + 36 + 4 =

Answers to Quiz Questions:

1. 252. 283. 214. 2005. 200

6. 2127. 2258. 329. 19810. 139

You may repeat this deck for additional practice.