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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 57 · 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. 1.9 × 5 = 4? — what is the missing digit?
  2. 2.59 × 4 =
  3. 3.Magic trick! Think of 7. Double it, add 14, halve it, then take away 7. What number do you get?
  4. 4.22 × 4 =
  5. 5.1 + 3 + 5 + … + 31 =
  6. 6.9 × 5 = ?5 — what is the missing digit?
  7. 7.15?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.16 × ? = 1600
  9. 9.Take 823. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  10. 10.9 × 4 = ?6 — what is the missing digit?
  11. 11.12 × 8 + 2 =
  12. 12.131 × 10 =
  13. 13.Magic square (every row, column and diagonal has the same total): 27 6 21 | 12 18 24 | ? 30 9. What is the missing number?
  14. 14.43 × 4 =
  15. 15.30 × 4 =
  16. 16.I thought of a number, multiplied it by 2 and added 7. I got 29. What was my number?
  17. 17.What comes next? 16, 25, 36, 49, ? (a) 66 (b) 62 (c) 64 (d) 65
  18. 18.If today is Friday, what day was it 53 days ago? (a) Monday (b) Tuesday (c) Sunday (d) Thursday
  19. 19.Do the 1089 trick with 228: reverse and subtract, then reverse that answer and add. What do you get?
  20. 20.9 × 2 = ?8 — what is the missing digit?
  21. 21.5?32 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.9 × 3 = 2? — what is the missing digit?
  23. 23.Take 896. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  24. 24.If today is Tuesday, what day was it 21 days ago? (a) Wednesday (b) Monday (c) Tuesday (d) Friday
  25. 25.37 × 21 =
  26. 26.396 + 693 =
  27. 27.Think of 11. Multiply it by 3, then add 1. What number do you end with?
  28. 28.10 × 9 =
  29. 29.12345679 × 45 =
  30. 30.Double 13 =
  31. 31.9 × 9 = ?1 — what is the missing digit?
  32. 32.A girl is 11 years old and her brother is 5 years older. How old will her brother be in 3 years?
  33. 33.12345679 × 27 =
  34. 34.9 × 1 =
  35. 35.24 × 4 =
  36. 36.Double 29 =
  37. 37.A father is 31 years old and his son is 10. How old was the father when the son was born?
  38. 38.Magic square (every row, column and diagonal has the same total): 12 14 ? | 2 10 18 | 16 6 8. What is the missing number?
  39. 39.I thought of a number, added 6 and then doubled it. I got 42. What was my number?
  40. 40.A girl is 8 years old and her brother is 3 years older. How old will her brother be in 7 years?

Answer key

  1. 5
  2. 236
  3. 7
  4. 88
  5. 256
  6. 4
  7. 7
  8. 100
  9. 495
  10. 3
  11. 98
  12. 1310
  13. 15
  14. 172
  15. 120
  16. 11
  17. 64
  18. Monday
  19. 1089
  20. 1
  21. 8
  22. 7
  23. 198
  24. Tuesday
  25. 777
  26. 1089
  27. 34
  28. 90
  29. 555555555
  30. 26
  31. 8
  32. 19
  33. 333333333
  34. 9
  35. 96
  36. 58
  37. 21
  38. 4
  39. 15
  40. 18

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