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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 622 · 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.Odd one out: which number is NOT in the 9 times table? (a) 36 (b) 65 (c) 18 (d) 63
  2. 2.9 × 3 = 2? — what is the missing digit?
  3. 3.14 × 1000 =
  4. 4.9 × 5 = 4? — what is the missing digit?
  5. 5.What comes next? 2, 4, 8, 16, ? (a) 32 (b) 24 (c) 33 (d) 28
  6. 6.123456789 × 8 + 9 =
  7. 7.1 + 2 + 3 + … + 72 =
  8. 8.32 × 4 =
  9. 9.The ages of two twins add up to 30. How old is each twin?
  10. 10.9 × 9 =
  11. 11.Half of 22 =
  12. 12.1 + 2 + 3 + … + 39 =
  13. 13.Half of 32 =
  14. 14.27 × 4 =
  15. 15.?917 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.Double 22 =
  17. 17.Magic square (every row, column and diagonal has the same total): 3 8 7 | 10 6 2 | 5 ? 9. What is the missing number?
  18. 18.822 × ? = 8220
  19. 19.What comes next? 9, 13, 17, 21, ? (a) 21 (b) 26 (c) 25 (d) 29
  20. 20.Double 31 =
  21. 21.If today is Tuesday, what day was it 35 days ago? (a) Friday (b) Tuesday (c) Monday (d) Wednesday
  22. 22.309 × 10 =
  23. 23.In 3 years a boy will be 12 years old. How old was he 5 years ago?
  24. 24.Take 961. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  25. 25.I thought of a number, multiplied it by 2 and added 9. I got 33. What was my number?
  26. 26.4 × 9 =
  27. 27.?821 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.9 × 6 = ?4 — what is the missing digit?
  29. 29.1234567 × 9 + 8 =
  30. 30.9 × 5 = ?5 — what is the missing digit?
  31. 31.A father is 44 years old and his son is 14. How old was the father when the son was born?
  32. 32.Take 874. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  33. 33.25 × 4 =
  34. 34.285 × 10 =
  35. 35.Double 14 =
  36. 36.1 + 2 + 3 + … + 81 =
  37. 37.9 × 6 = 5? — what is the missing digit?
  38. 38.9 × 4 = 3? — what is the missing digit?
  39. 39.59 × 4 =
  40. 40.9 × 4 =

Answer key

  1. 65
  2. 7
  3. 14000
  4. 5
  5. 32
  6. 987654321
  7. 2628
  8. 128
  9. 15
  10. 81
  11. 11
  12. 780
  13. 16
  14. 108
  15. 1
  16. 44
  17. 4
  18. 10
  19. 25
  20. 62
  21. Tuesday
  22. 3090
  23. 4
  24. 792
  25. 12
  26. 36
  27. 7
  28. 5
  29. 11111111
  30. 4
  31. 30
  32. 396
  33. 100
  34. 2850
  35. 28
  36. 3321
  37. 4
  38. 6
  39. 236
  40. 36

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