18 original worksheets with answers.
printmotifsBrain teaser 1
A number is doubled, then increased by 6. The result is 24. What was the number?
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9, because 9 × 2 + 6 = 24.
printmotifsAnswer · Brain teaser 1
9, because 9 × 2 + 6 = 24.
printmotifsBrain teaser 2
Four hikers share 20 nuts. Each receives two more than the previous hiker. How many does the first receive?
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2; the shares are 2, 4, 6 and 8.
printmotifsAnswer · Brain teaser 2
2; the shares are 2, 4, 6 and 8.
printmotifsBrain teaser 3
One book lies between two books, and two books lie beside it. What is the smallest number of books?
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Three books in one row.
printmotifsAnswer · Brain teaser 3
Three books in one row.
printmotifsBrain teaser 4
A number is multiplied by 2, then increased by 3. The result is 11. What was the number?
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4, because 4 × 2 + 3 = 11.
printmotifsAnswer · Brain teaser 4
4, because 4 × 2 + 3 = 11.
printmotifsBrain teaser 5
A number is multiplied by 3, then increased by 4. The result is 19. What was the number?
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5, because 5 × 3 + 4 = 19.
printmotifsAnswer · Brain teaser 5
5, because 5 × 3 + 4 = 19.
printmotifsBrain teaser 6
A number is multiplied by 4, then increased by 5. The result is 29. What was the number?
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6, because 6 × 4 + 5 = 29.
printmotifsAnswer · Brain teaser 6
6, because 6 × 4 + 5 = 29.
printmotifsBrain teaser 7
A number is multiplied by 5, then increased by 6. The result is 41. What was the number?
Show answer
7, because 7 × 5 + 6 = 41.
printmotifsAnswer · Brain teaser 7
7, because 7 × 5 + 6 = 41.
printmotifsBrain teaser 8
A number is multiplied by 2, then increased by 7. The result is 23. What was the number?
Show answer
8, because 8 × 2 + 7 = 23.
printmotifsAnswer · Brain teaser 8
8, because 8 × 2 + 7 = 23.
printmotifsBrain teaser 9
A number is multiplied by 3, then increased by 8. The result is 35. What was the number?
Show answer
9, because 9 × 3 + 8 = 35.
printmotifsAnswer · Brain teaser 9
9, because 9 × 3 + 8 = 35.
printmotifsBrain teaser 10
A number is multiplied by 4, then increased by 9. The result is 49. What was the number?
Show answer
10, because 10 × 4 + 9 = 49.
printmotifsAnswer · Brain teaser 10
10, because 10 × 4 + 9 = 49.
printmotifsBrain teaser 11
A number is multiplied by 5, then increased by 3. The result is 58. What was the number?
Show answer
11, because 11 × 5 + 3 = 58.
printmotifsAnswer · Brain teaser 11
11, because 11 × 5 + 3 = 58.
printmotifsBrain teaser 12
A number is multiplied by 2, then increased by 4. The result is 28. What was the number?
Show answer
12, because 12 × 2 + 4 = 28.
printmotifsAnswer · Brain teaser 12
12, because 12 × 2 + 4 = 28.
printmotifsBrain teaser 13
A number is multiplied by 3, then increased by 5. The result is 44. What was the number?
Show answer
13, because 13 × 3 + 5 = 44.
printmotifsAnswer · Brain teaser 13
13, because 13 × 3 + 5 = 44.
printmotifsBrain teaser 14
A number is multiplied by 4, then increased by 6. The result is 62. What was the number?
Show answer
14, because 14 × 4 + 6 = 62.
printmotifsAnswer · Brain teaser 14
14, because 14 × 4 + 6 = 62.
printmotifsBrain teaser 15
A number is multiplied by 5, then increased by 7. The result is 82. What was the number?
Show answer
15, because 15 × 5 + 7 = 82.
printmotifsAnswer · Brain teaser 15
15, because 15 × 5 + 7 = 82.
printmotifsBrain teaser 16
A number is multiplied by 2, then increased by 8. The result is 40. What was the number?
Show answer
16, because 16 × 2 + 8 = 40.
printmotifsAnswer · Brain teaser 16
16, because 16 × 2 + 8 = 40.
printmotifsBrain teaser 17
A number is multiplied by 3, then increased by 9. The result is 60. What was the number?
Show answer
17, because 17 × 3 + 9 = 60.
printmotifsAnswer · Brain teaser 17
17, because 17 × 3 + 9 = 60.
printmotifsBrain teaser 18
A number is multiplied by 4, then increased by 3. The result is 75. What was the number?
Show answer
18, because 18 × 4 + 3 = 75.
printmotifsAnswer · Brain teaser 18
18, because 18 × 4 + 3 = 75.
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