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This Mental Math Practice Deck covers Groups of 10s and Groups of 100s.
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M204 – Math Olympiad Level 4Mental Math Practice Deck 1
Copyrights © 2006-2014- Avid Academy
Guided Practice Questions
Attempt each question in 10 seconds or less, then view the following slide for the correct answer.
1 + 8 + 3 + 7 + 9 =
Practice 1
(1 + 9) + (3 + 7) + 8 =
28
Practice 1
Practice 2
4 + 3 + 5 + 6 + 5 =
(4 + 6) + (5 + 5) + 3 =
23
Practice 2
Practice 3
2 + 5 + 2 + 8 + 3 =
(2 + 8) + (5 + 2 + 3) =
20
Practice 3
Practice 4
7 + 4 + 1 + 3 + 6 =
(7 + 3) + (4 + 6) + 1 =
21
Practice 4
Practice 5
4 + 5 + 8 + 2 + 1 =
(4 + 5 + 1) + (8 + 2) =
20
Practice 5
Practice 6
3 + 6 + 9 + 1 + 7 + 5 =
(3 + 7) + (9 + 1) + 6 + 5 =
31
Practice 6
Practice 7
8 + 5 + 1 + 9 + 5 + 7 =
(5 + 5) + (1 + 9) + 8 + 7 =
35
Practice 7
Practice 8
2 + 6 + 8 + 4 + 9 + 4 =
(2 + 8) + (6 + 4) + 9 + 4 =
33
Practice 8
Practice 9
1 + 7 + 2 + 5 + 1 + 4 =
(1 + 7 + 2) + (5 + 1 + 4) =
20
Practice 9
Practice 10
2 + 3 + 1 + 9 + 3 + 1=
(2 + 3 + 3) + (1 + 9) + 1 =
21
Practice 10
Practice 11
36 + 28 + 64 + 72 =
(36 + 64) + (28 + 72) =
200
Practice 11
Practice 12
91 + 18 + 22 + 9 + 82 =
(91 + 9) + (18 + 82) + 22 =
222
Practice 12
Practice 13
23 + 43 + 27 + 57 =
(43 + 57) + 23 + 27 =
150
Practice 13
Practice 14
94 + 4 + 61 + 2 + 39 =
(94 + 4 + 2) + (61 + 39) =
200
Practice 14
Practice 15
25 + 45 + 55 + 75 =
(25 + 75) + (45 + 55) =
200
Practice 15
Practice 16
12 + 19 + 44 + 81 + 44 =
(12 + 44 + 44) + (19 + 81) =
200
Practice 16
Practice 17
78 + 97 + 32 + 3 + 10 =
(93 + 3) + 78 + 32 + 10 =
220
Practice 17
Practice 18
49 + 17 + 51 + 35 + 65 =
(49 + 51) + (35 + 65) + 17 =
217
Practice 18
Practice 19
15 + 74 + 16 + 26 + 14 =
(74 + 26) + 15 + 16 + 14 =
145
Practice 19
Practice 20
108 + 19 + 92 + 81 + 13 =
(108 + 92) + (19 + 81) + 13 =
313
Practice 20
Practice 21
8 + 1 + 4 + 2 + 6 + 4 =
(8 + 2) + (4 + 6) + 1 + 4 =
25
Practice 21
Practice 22
5 + 7 + 5 + 7 + 3 + 6 =
(5 + 5) + (7 + 3) + 7 + 6 =
33
Practice 22
Practice 23
29 + 41 + 71 + 30 + 59 =
(29 + 71) + (41 + 59) + 30 =
230
Practice 23
Practice 24
1 + 8 + 2 + 1 + 7 + 1=
(1 + 1 + 7 + 1) + (8 + 2) =
20
Practice 24
Practice 25
38 + 2 + 18 + 62 + 85 =
(38 + 62) + 2 + 18 + 85 =
205
Practice 25
Practice 26
92 + 6 + 24 + 2 + 76 =
(92 + 6 + 2) + (24 + 76)=
200
Practice 26
Practice 27
87 + 47 + 23 + 53 =
(47 + 53) + 87 + 23 =
210
Practice 27
Practice 28
6 + 34 + 66 + 44 =
(34 + 66) + 6 + 44 =
150
Practice 28
Practice 29
4 + 5 + 2 + 3 + 6 + 1 =
(4 + 6) + (5 + 2 + 3) + 1 =
21
Practice 29
Practice 30
16 + 42 + 32 + 84=
(16 + 84) + 42 + 32 =
174
Practice 30
Practice 31
28 + 5 + 2 + 7 + 5 + 1 =
(28 + 2) + (5 + 5) + 7 + 1 =
48
Practice 31
Practice 32
1 + 7 + 14 + 23 + 49 =
(1 + 49) + (7 + 23) + 14 =
94
Practice 32
Practice 33
19 + 55 + 81 + 5 + 40 =
(19 + 81) + (55 + 5 + 40) =
200
Practice 33
Practice 34
91 + 75 + 5 + 25 + 4 =
(91 + 5 + 4) + (75 + 25) =
200
Practice 34
Practice 35
4 + 7 + 9 + 6 + 5 + 1=
(4 + 6) + (9 + 1) + 7 + 5 =
32
Practice 35
Practice 36
63 + 42 + 37 + 8 + 13 =
(63 + 37) + (42 + 8) + 13 =
163
Practice 36
Practice 37
17 + 60 + 45 + 23 =
(17 + 60 + 23) + 45 =
145
Practice 37
Practice 38
8 + 6 + 2 + 7 + 9 + 3 =
(8 + 2) + (7 + 3) + 6 + 9 =
35
Practice 38
Practice 39
79 + 13 + 21 + 37 + 50 =
(79 + 21) + (13 + 37 + 50) =
200
Practice 39
Practice 40
5 + 4 + 7 + 2 + 8 + 3 + 1=
(5 + 4 + 1) + (7 + 3) + (8 + 2) =
30
Practice 40
Practice 41
19 + 4 + 26 + 1 + 8 =
(19 + 1) + (4 + 26) + 1 + 8 =
59
Practice 41
Practice 42
25 + 15 + 4 + 5 + 6 + 5 =
(25 + 5) + (15 + 5) + (4 + 6) =
60
Practice 42
Practice 43
6 + 32 + 24 + 18 + 14 + 16 =
(6 + 24) + (32 + 18) + (14 + 16) =
100
Practice 43
Practice 44
98 + 17 + 183 + 102 =
(98 + 102) + (17 + 183) =
400
Practice 44
Practice 45
148 + 127 + 152 + 101 + 173 =
(148 + 152) + (127 + 173) + 101 =
701
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
2 + 7 + 5 + 3 + 8 + 4 =
Quiz Question 2
9 + 6 + 4 + 3 + 8 + 1 =
Quiz Question 3
2 + 5 + 7 + 5 + 1 + 4 =
Quiz Question 4
8 + 32 + 68 + 12 + 92 =
Quiz Question 5
53 + 74 + 47 + 35 =
Quiz Question 6
18 + 93 + 29 + 82 + 71 =
Quiz Question 7
8 + 7 + 90 + 2 + 3 + 8 =
Quiz Question 8
5 + 11 + 7 + 9 + 15 =
Quiz Question 9
23 + 9 + 7 + 3 + 17 + 4 =
Quiz Question 10
132 + 97 + 68 + 105 + 103 =
Answers to Quiz Questions:
1. 292. 313. 244. 2125. 209
6. 2937. 1188. 499. 6310. 505
You may repeat this deck for additional practice.
