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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 457 · 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. 1.1 + 3 + 5 + … + 37 =
  2. 2.Think of 9. Multiply it by 5, then add 1. What number do you end with?
  3. 3.Take 99 and take away the sum of its digits. What do you get?
  4. 4.A father is 33 years old and his son is 4. How old was the father when the son was born?
  5. 5.1 + 3 + 5 + … + 11 =
  6. 6.9 × 8 =
  7. 7.Magic square (every row, column and diagonal has the same total): 9 2 7 | 4 6 8 | 5 ? 3. What is the missing number?
  8. 8.6 × 9 =
  9. 9.Double 74 =
  10. 10.9 × 4 = 3? — what is the missing digit?
  11. 11.840 × 10 =
  12. 12.What comes next? 3, 6, 12, 24, ? (a) 42 (b) 36 (c) 48 (d) 49
  13. 13.Magic square (every row, column and diagonal has the same total): 11 16 9 | 10 ? 14 | 15 8 13. What is the missing number?
  14. 14.The 1st of a month is a Saturday. What day is the 29th of the same month? (a) Sunday (b) Tuesday (c) Friday (d) Saturday
  15. 15.Magic square (every row, column and diagonal has the same total): 18 15 30 | 33 ? 9 | 12 27 24. What is the missing number?
  16. 16.396 + 693 =
  17. 17.12 × 9 + 3 =
  18. 18.9 × 2 = ?8 — what is the missing digit?
  19. 19.If today is Sunday, what day was it 35 days ago? (a) Wednesday (b) Monday (c) Sunday (d) Saturday
  20. 20.9 × 5 = 4? — what is the missing digit?
  21. 21.123456789 × 8 + 9 =
  22. 22.9 × 3 = ?7 — what is the missing digit?
  23. 23.3 × 9 =
  24. 24.In 3 years a boy will be 13 years old. How old was he 7 years ago?
  25. 25.48 × 4 =
  26. 26.123456 × 8 + 6 =
  27. 27.A girl is 12 years old and her brother is 2 years older. How old will her brother be in 8 years?
  28. 28.8 × 9 =
  29. 29.Magic square (every row, column and diagonal has the same total): 14 ? 8 | 11 17 23 | 26 5 20. What is the missing number?
  30. 30.46 × 100 =
  31. 31.3 × 1000 =
  32. 32.Magic square (every row, column and diagonal has the same total): 15 30 27 | ? 24 12 | 21 18 33. What is the missing number?
  33. 33.Double 71 =
  34. 34.?874 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.1 + 3 + 5 + … + 9 =
  36. 36.9 × 8 = ?2 — what is the missing digit?
  37. 37.A girl is 7 years old and her brother is 5 years older. How old will her brother be in 8 years?
  38. 38.Magic square (every row, column and diagonal has the same total): 25 28 13 | 10 22 34 | 31 16 ?. What is the missing number?
  39. 39.?294 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.9 × 10 = 9? — what is the missing digit?

Answer key

  1. 361
  2. 46
  3. 81
  4. 29
  5. 36
  6. 72
  7. 10
  8. 54
  9. 148
  10. 6
  11. 8400
  12. 48
  13. 12
  14. Saturday
  15. 21
  16. 1089
  17. 111
  18. 1
  19. Sunday
  20. 5
  21. 987654321
  22. 2
  23. 27
  24. 3
  25. 192
  26. 987654
  27. 22
  28. 72
  29. 29
  30. 4600
  31. 3000
  32. 36
  33. 142
  34. 8
  35. 25
  36. 7
  37. 20
  38. 19
  39. 3
  40. 0

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