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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 421 · 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.Double 65 =
  2. 2.1 + 2 + 3 + … + 18 =
  3. 3.Half of 36 =
  4. 4.Take 92 and take away the sum of its digits. What do you get?
  5. 5.Magic square (every row, column and diagonal has the same total): 7 8 3 | 2 6 10 | 9 4 ?. What is the missing number?
  6. 6.35 × 1000 =
  7. 7.24 × 4 =
  8. 8.36 × 4 =
  9. 9.9 × 9 =
  10. 10.587 × ? = 5870
  11. 11.4 × 9 =
  12. 12.12345679 × 45 =
  13. 13.30 × 4 =
  14. 14.Take 36 and take away the sum of its digits. What do you get?
  15. 15.A girl is 10 years old and her brother is 4 years older. How old will her brother be in 4 years?
  16. 16.9 × 7 = 6? — what is the missing digit?
  17. 17.Take 870. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  18. 18.9 × 3 =
  19. 19.34 × 4 =
  20. 20.1 + 3 + 5 + … + 31 =
  21. 21.123 × 9 + 4 =
  22. 22.A father is 41 years old and his son is 6. How old was the father when the son was born?
  23. 23.?301 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.693 + 396 =
  25. 25.54 × 100 =
  26. 26.In 4 years a boy will be 17 years old. How old was he 2 years ago?
  27. 27.In 6 years a boy will be 16 years old. How old was he 7 years ago?
  28. 28.Take 55 and take away the sum of its digits. What do you get?
  29. 29.9 × 8 = ?2 — what is the missing digit?
  30. 30.111111 × 111111 =
  31. 31.52 × 4 =
  32. 32.What comes next? 6, 13, 20, 27, ? (a) 41 (b) 35 (c) 27 (d) 34
  33. 33.What comes next? 3, 7, 11, 15, ? (a) 23 (b) 15 (c) 20 (d) 19
  34. 34.If today is Sunday, what day will it be after 27 days? (a) Tuesday (b) Friday (c) Sunday (d) Saturday
  35. 35.Double 62 =
  36. 36.9 × 2 =
  37. 37.If today is Sunday, what day will it be after 98 days? (a) Wednesday (b) Monday (c) Sunday (d) Saturday
  38. 38.58 × 4 =
  39. 39.Take 137. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  40. 40.9 × 1 =

Answer key

  1. 130
  2. 171
  3. 18
  4. 81
  5. 5
  6. 35000
  7. 96
  8. 144
  9. 81
  10. 10
  11. 36
  12. 555555555
  13. 120
  14. 27
  15. 18
  16. 3
  17. 792
  18. 27
  19. 136
  20. 256
  21. 1111
  22. 35
  23. 5
  24. 1089
  25. 5400
  26. 11
  27. 3
  28. 45
  29. 7
  30. 12345654321
  31. 208
  32. 34
  33. 19
  34. Saturday
  35. 124
  36. 18
  37. Sunday
  38. 232
  39. 594
  40. 9

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