1. M203 – Math Olympiad Level
3
Mental Math Practice Deck 1
Copyrights © 2006-2014- Avid Academy

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

3. 6 + 3 + 5 + 7 =
Practice 1

4. (3 + 7) + 6 + 5 =
21
Practice 1

5. Practice 2
2 + 9 + 3 + 8 =

6. (2 + 8) + 9 + 3 =
22
Practice 2

7. Practice 3
6 + 7 + 9 + 1 + 4 =

8. (6 + 4) + (9 + 1) + 7 =
27
Practice 3

9. Practice 4
8 + 1 + 5 + 1 + 5 =

10. (5 + 5) + (8 + 1 + 1) =
20
Practice 4

11. Practice 5
4 + 7 + 2 + 6 + 3 =

12. (4 + 6) + (7 + 3) + 2 =
22
Practice 5

13. Practice 6
6 + 9 + 2 + 1 + 5 + 3 =

14. (9 + 1) + (2 + 5 + 3) + 6 =
26
Practice 6

15. Practice 7
4 + 3 + 8 + 9 + 2 + 7 =

16. (3 + 7) + (8 + 2) + 4 + 9 =
33
Practice 7

17. Practice 8
5 + 1 + 7 + 4 + 8 =

18. (5 + 1 + 4) + 7 + 8 =
25
Practice 8

19. Practice 9
1 + 6 + 8 + 9 + 4 =

20. (1 + 9) + (6 + 4) + 8 =
28
Practice 9

21. Practice 10
8 + 1 + 7 + 2 + 2 =

22. (8 + 2) + (7 + 1 + 2) =
20
Practice 10

23. Practice 11
92 + 57 + 8 + 43 =

24. (92 + 8) + (57 + 43) =
200
Practice 11

25. Practice 12
86 + 24 + 14 + 26 =

26. (86 + 14) + 24 + 26=
250
Practice 12

27. Practice 13
35 + 78 + 65 =

28. (35 + 65) + 78 =
178
Practice 13

29. Practice 14
27 + 74 + 73 + 26 =

30. (27 + 73) + (74 + 26) =
200
Practice 14

31. Practice 15
35 + 45 + 55 + 65 =

32. (35 + 65) + (45 + 55) =
200
Practice 15

33. Practice 16
17 + 46 + 93 + 54 =

34. (46 + 54) + 93 + 17 =
210
Practice 16

35. Practice 17
74 + 18 + 21 + 82 =

36. (18 + 82) + 74 + 21=
195
Practice 17

37. Practice 18
9 + 11 + 23 + 77 + 91 =

38. (9 + 91) + (23 + 77) + 11 =
211
Practice 18

39. Practice 19
38 + 62 + 67 + 36 =

40. (38 + 62) + 67 + 36 =
203
Practice 19

41. Practice 20
98 + 12 + 1 + 88 + 1=

42. (98 + 1 + 1) + (12 + 88) =
200
Practice 20

43. Practice 21
1 + 3 + 5 + 5 + 7 =

44. (3 + 7) + (5 + 5) + 1 =
21
Practice 21

45. Practice 22
1 + 6 + 3 + 9 + 4 =

46. (1 + 9) + (6 + 4) + 3 =
23
Practice 22

47. Practice 23
96 + 87 + 12 + 4 =

48. (96 + 4) + 87 + 12 =
199
Practice 23

49. Practice 24
7 + 2 + 5 + 8 =

50. (2 + 8) + 7 + 5 =
22
Practice 24

51. Practice 25
19 + 78 + 22 + 81 + 29 =

52. (19 + 81) + (78 + 22) + 29 =
229
Practice 25

53. Practice 26
5 + 34 + 4 + 66 + 3 =

54. (34 + 66) + 5 + 4 + 3 =
112
Practice 26

55. Practice 27
83 + 43 + 27 + 57 =

56. (43 + 57) + 83 + 27 =
210
Practice 27

57. Practice 28
7 + 23 + 77 + 33 =

58. (23 + 77) + 7 + 33 =
140
Practice 28

59. Practice 29
4 + 5 + 6 + 2 + 7 =

60. (4 + 6) + 5 + 2 + 7 =
24
Practice 29

61. Practice 30
16 + 92 + 6 + 84 =

62. (16 + 84) + 92 + 6 =
198
Practice 30

63. Practice 31
8 + 6 + 1 + 42 + 4 =

64. (8 + 42) + (6 + 4) + 1 =
61
Practice 31

65. Practice 32
19 + 5 + 11 + 5 =

66. (19 + 11) + (5 + 5) =
40
Practice 32

67. Practice 33
39 + 45 + 61 + 5 + 50 =

68. (39 + 61) + (45 + 5 + 50) =
200
Practice 33

69. Practice 34
93 + 18 + 3 + 22 + 4 =

70. (93 + 3 + 4) + 18 + 22 =
140
Practice 34

71. Practice 35
1 + 4 + 7 + 9 + 3 + 5 =

72. (1 + 9) + (7 + 3) + 4 + 5 =
29
Practice 35

73. Practice 36
47 + 19 + 31 + 53 =

74. (47 + 53) + 19 + 31 =
150
Practice 36

75. Practice 37
27 + 60 + 45 + 13 =

76. (27 + 60 + 13) + 45 =
145
Practice 37

77. Practice 38
8 + 5 + 4 + 5 + 6 + 1 =

78. (5 + 5) + (4 + 6) + 8 + 1 =
29
Practice 38

79. Practice 39
23 + 34 + 66 + 77 =

80. (23 + 77) + (34 + 66) =
200
Practice 39

81. Practice 40
1 + 8 + 7 + 1 + 4 =

82. (1 + 8 + 1) + 7 + 4 =
21
Practice 40

83. Practice 41
15 + 9 + 5 + 11 + 7 =

84. (15 + 5) + (9 + 11) + 7 =
47
Practice 41

85. Practice 42
8 + 13 + 9 + 2 + 7 =

86. (8 + 2) + (13 + 7) + 9 =
39
Practice 42

87. Practice 43
6 + 11 + 3 + 14 + 9 =

88. (6 + 14) + (11 + 9) + 3 =
43
Practice 43

89. Practice 44
98 + 7 + 1 + 3 + 2 =

90. (98 + 2) + (7 + 3) + 1 =
111
Practice 44

91. Practice 45
1 + 7 + 2 + 5 + 6 + 5 =

92. (1 + 7 + 2) + (5 + 5) + 6 =
26
Practice 45

93. 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.

94. Quiz Question 1
1 + 3 + 5 + 7 + 9 =

95. Quiz Question 2
6 + 3 + 7 + 4 + 8 =

96. Quiz Question 3
1 + 5 + 4 + 8 + 1 + 2 =

97. Quiz Question 4
21 + 82 + 79 + 18 =

98. Quiz Question 5
34 + 46 + 54 + 66 =

99. Quiz Question 6
92 + 47 + 8 + 12 + 53 =

100. Quiz Question 7
9 + 27 + 91 + 25 + 73 =

101. Quiz Question 8
8 + 2 + 1 + 7 + 9 + 5 =

102. Quiz Question 9
14 + 90 + 1 + 86 + 7 =

103. Quiz Question 10
32 + 64 + 3 + 36 + 4 =

104. Answers to Quiz Questions:
1. 25
2. 28
3. 21
4. 200
5. 200
6. 212
7. 225
8. 32
9. 198
10. 139

105. You may repeat this deck for additional
practice.