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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 492 · 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. 1.17 × 4 =
  2. 2.8 × 9 =
  3. 3.Half of 172 =
  4. 4.91 × ? = 9100
  5. 5.1 + 2 + 3 + … + 61 =
  6. 6.Magic square (every row, column and diagonal has the same total): 19 22 7 | 4 16 28 | 25 ? 13. What is the missing number?
  7. 7.1 + 3 + 5 + … + 9 =
  8. 8.Magic trick! Think of 3. Double it, add 14, halve it, then take away 3. What number do you get?
  9. 9.51 × 4 =
  10. 10.Take 187. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  11. 11.6 × 9 =
  12. 12.1 + 3 + 5 + … + 31 =
  13. 13.Magic square (every row, column and diagonal has the same total): 9 4 5 | 2 6 10 | ? 8 3. What is the missing number?
  14. 14.Double 54 =
  15. 15.26 × ? = 26000
  16. 16.?008 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.A girl is 7 years old and her brother is 2 years older. How old will her brother be in 5 years?
  18. 18.Double 85 =
  19. 19.9 × 2 =
  20. 20.9 × 9 = 8? — what is the missing digit?
  21. 21.What comes next? 15, 23, 31, 39, ? (a) 39 (b) 55 (c) 48 (d) 47
  22. 22.Half of 196 =
  23. 23.9 × 7 = 6? — what is the missing digit?
  24. 24.1 + 3 + 5 + … + 17 =
  25. 25.1 + 2 + 3 + … + 87 =
  26. 26.9 × 5 = ?5 — what is the missing digit?
  27. 27.123 × 8 + 3 =
  28. 28.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 70 (c) 80 (d) 81
  29. 29.9 × 2 = 1? — what is the missing digit?
  30. 30.9 × 8 = 7? — what is the missing digit?
  31. 31.511 × 10 =
  32. 32.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  33. 33.9 × 8 = ?2 — what is the missing digit?
  34. 34.9 × 6 = 5? — what is the missing digit?
  35. 35.51?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.35 × 4 =
  37. 37.What comes next? 7, 15, 23, 31, ? (a) 31 (b) 47 (c) 40 (d) 39
  38. 38.Think of 11. Multiply it by 2, then add 9. What number do you end with?
  39. 39.37 × 12 =
  40. 40.9 × 7 = ?3 — what is the missing digit?

Answer key

  1. 68
  2. 72
  3. 86
  4. 100
  5. 1891
  6. 10
  7. 25
  8. 7
  9. 204
  10. 594
  11. 54
  12. 256
  13. 7
  14. 108
  15. 1000
  16. 1
  17. 14
  18. 170
  19. 18
  20. 1
  21. 47
  22. 98
  23. 3
  24. 81
  25. 3828
  26. 4
  27. 987
  28. 80
  29. 8
  30. 2
  31. 5110
  32. 396
  33. 7
  34. 4
  35. 7
  36. 140
  37. 39
  38. 31
  39. 444
  40. 6

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