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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 96 · 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.Half of 122 =
  2. 2.If today is Thursday, what day was it 36 days ago? (a) Wednesday (b) Tuesday (c) Thursday (d) Saturday
  3. 3.47 × ? = 4700
  4. 4.9 × 2 =
  5. 5.50 × 4 =
  6. 6.Half of 32 =
  7. 7.A girl is 10 years old and her brother is 4 years older. How old will her brother be in 8 years?
  8. 8.54?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.9 × 5 = ?5 — what is the missing digit?
  10. 10.Think of 9. Multiply it by 2, then add 4. What number do you end with?
  11. 11.A girl is 11 years old and her brother is 4 years older. How old will her brother be in 4 years?
  12. 12.What comes next? 1, 2, 4, 8, ? (a) 17 (b) 12 (c) 16 (d) 14
  13. 13.25 × 4 =
  14. 14.9 × 4 = ?6 — what is the missing digit?
  15. 15.3 × 1000 =
  16. 16.693 + 396 =
  17. 17.Magic square (every row, column and diagonal has the same total): ? 15 13 | 19 11 3 | 9 7 17. What is the missing number?
  18. 18.A father is 43 years old and his son is 8. How old was the father when the son was born?
  19. 19.Half of 14 =
  20. 20.9 × 7 =
  21. 21.9 × 5 = 4? — what is the missing digit?
  22. 22.If today is Friday, what day was it 13 days ago? (a) Saturday (b) Friday (c) Sunday (d) Tuesday
  23. 23.3 × 9 =
  24. 24.In 5 years a boy will be 15 years old. How old was he 4 years ago?
  25. 25.9 × 3 =
  26. 26.Double 74 =
  27. 27.I thought of a number, added 9 and then doubled it. I got 30. What was my number?
  28. 28.9 × 9 =
  29. 29.9 × 6 = ?4 — what is the missing digit?
  30. 30.1 + 3 + 5 + … + 19 =
  31. 31.A father is 35 years old and his son is 7. How old was the father when the son was born?
  32. 32.Magic square (every row, column and diagonal has the same total): 18 8 22 | ? 16 12 | 10 24 14. What is the missing number?
  33. 33.In 6 years a boy will be 16 years old. How old was he 4 years ago?
  34. 34.6 × 9 =
  35. 35.Take 501. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  36. 36.12345679 × 18 =
  37. 37.Take 952. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  38. 38.1 + 2 + 3 + … + 25 =
  39. 39.17 × 4 =
  40. 40.The ages of two twins add up to 14. How old is each twin?

Answer key

  1. 61
  2. Wednesday
  3. 100
  4. 18
  5. 200
  6. 16
  7. 22
  8. 3
  9. 4
  10. 22
  11. 19
  12. 16
  13. 100
  14. 3
  15. 3000
  16. 1089
  17. 5
  18. 35
  19. 7
  20. 63
  21. 5
  22. Saturday
  23. 27
  24. 6
  25. 27
  26. 148
  27. 6
  28. 81
  29. 5
  30. 100
  31. 28
  32. 20
  33. 6
  34. 54
  35. 396
  36. 222222222
  37. 693
  38. 325
  39. 68
  40. 7

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