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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 648 · 40 questions
TalentJR

The trick (Choose a trick): × 9 → finger trick; × 4 → double double; × 10, 100, 1000 → slide and add zeros. 37, 12345679 or 111… → magic patterns; reverse and subtract → 1089. Puzzles: find the rule, the total or the leftover days, then check your answer.

NameDateTime takenScore ___ / 40
  1. 1.57 × 4 =
  2. 2.50 × ? = 50000
  3. 3.12345679 × 9 =
  4. 4.58 × 4 =
  5. 5.48 × 100 =
  6. 6.Magic square (every row, column and diagonal has the same total): 18 21 ? | 3 15 27 | 24 9 12. What is the missing number?
  7. 7.59 × 4 =
  8. 8.11111 × 11111 =
  9. 9.37 × 9 =
  10. 10.37 × 6 =
  11. 11.What comes next? 3, 6, 12, 24, ? (a) 42 (b) 49 (c) 48 (d) 36
  12. 12.1 + 3 + 5 + … + 25 =
  13. 13.Take 33 and take away the sum of its digits. What do you get?
  14. 14.9 × 5 = 4? — what is the missing digit?
  15. 15.If today is Thursday, what day was it 47 days ago? (a) Saturday (b) Friday (c) Sunday (d) Tuesday
  16. 16.37 × 27 =
  17. 17.Think of 13. Multiply it by 4, then add 1. What number do you end with?
  18. 18.9 × 9 = ?1 — what is the missing digit?
  19. 19.9 × 2 =
  20. 20.What comes next? 4, 13, 22, 31, ? (a) 49 (b) 31 (c) 40 (d) 41
  21. 21.Magic square (every row, column and diagonal has the same total): ? 34 19 | 28 22 16 | 25 10 31. What is the missing number?
  22. 22.Take 21 and take away the sum of its digits. What do you get?
  23. 23.585 × 10 =
  24. 24.The 1st of a month is a Thursday. What day is the 27th of the same month? (a) Wednesday (b) Monday (c) Friday (d) Tuesday
  25. 25.Magic square (every row, column and diagonal has the same total): 11 26 23 | 32 ? 8 | 17 14 29. What is the missing number?
  26. 26.9 × 8 = ?2 — what is the missing digit?
  27. 27.Half of 112 =
  28. 28.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 64 (c) 62 (d) 66
  29. 29.Magic square (every row, column and diagonal has the same total): 3 ? 7 | 10 6 2 | 5 4 9. What is the missing number?
  30. 30.9 × 6 =
  31. 31.Think of 9. Multiply it by 4, then add 1. What number do you end with?
  32. 32.I thought of a number, multiplied it by 2 and added 5. I got 31. What was my number?
  33. 33.9 × 3 = 2? — what is the missing digit?
  34. 34.1 + 3 + 5 + … + 13 =
  35. 35.Magic square (every row, column and diagonal has the same total): 6 7 ? | 1 5 9 | 8 3 4. What is the missing number?
  36. 36.What comes next? 14, 22, 30, 38, ? (a) 47 (b) 54 (c) 46 (d) 38
  37. 37.82?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.891 + 198 =
  39. 39.Double 51 =
  40. 40.Magic square (every row, column and diagonal has the same total): 11 ? 13 | 12 10 8 | 7 14 9. What is the missing number?

Answer key

  1. 228
  2. 1000
  3. 111111111
  4. 232
  5. 4800
  6. 6
  7. 236
  8. 123454321
  9. 333
  10. 222
  11. 48
  12. 169
  13. 27
  14. 5
  15. Saturday
  16. 999
  17. 53
  18. 8
  19. 18
  20. 40
  21. 13
  22. 18
  23. 5850
  24. Tuesday
  25. 20
  26. 7
  27. 56
  28. 64
  29. 8
  30. 54
  31. 37
  32. 13
  33. 7
  34. 49
  35. 2
  36. 46
  37. 1
  38. 1089
  39. 102
  40. 6

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