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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 396 · 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 × 3 = 2? — what is the missing digit?
  2. 2.98 × 100 =
  3. 3.111111 × 111111 =
  4. 4.20 × 4 =
  5. 5.9 × 4 = ?6 — what is the missing digit?
  6. 6.1 + 3 + 5 + … + 35 =
  7. 7.26 × ? = 2600
  8. 8.20 × ? = 20000
  9. 9.Magic trick! Think of 8. Double it, add 8, halve it, then take away 8. What number do you get?
  10. 10.4 × 1000 =
  11. 11.12?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.396 + 693 =
  13. 13.1 + 2 + 3 + … + 70 =
  14. 14.18 × 100 =
  15. 15.77?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.123 × 9 + 4 =
  17. 17.817 × ? = 8170
  18. 18.28 × 100 =
  19. 19.Half of 42 =
  20. 20.12345679 × 27 =
  21. 21.If today is Saturday, what day will it be after 88 days? (a) Saturday (b) Thursday (c) Tuesday (d) Wednesday
  22. 22.1 × 9 =
  23. 23.A father is 42 years old and his son is 7. How old was the father when the son was born?
  24. 24.9 × 2 = 1? — what is the missing digit?
  25. 25.Magic square (every row, column and diagonal has the same total): 14 9 10 | 7 11 ? | 12 13 8. What is the missing number?
  26. 26.1 + 2 + 3 + … + 10 =
  27. 27.Double 81 =
  28. 28.4 × 9 =
  29. 29.21 × 4 =
  30. 30.13 × 1000 =
  31. 31.What comes next? 2, 4, 8, 16, ? (a) 24 (b) 28 (c) 32 (d) 33
  32. 32.I thought of a number, multiplied it by 3 and added 5. I got 44. What was my number?
  33. 33.9 × 7 = ?3 — what is the missing digit?
  34. 34.Take 40 and take away the sum of its digits. What do you get?
  35. 35.If today is Saturday, what day will it be after 91 days? (a) Sunday (b) Tuesday (c) Saturday (d) Friday
  36. 36.1 + 3 + 5 + … + 11 =
  37. 37.The ages of two twins add up to 12. How old is each twin?
  38. 38.Half of 118 =
  39. 39.1 + 3 + 5 + … + 13 =
  40. 40.1 + 2 + 3 + … + 41 =

Answer key

  1. 7
  2. 9800
  3. 12345654321
  4. 80
  5. 3
  6. 324
  7. 100
  8. 1000
  9. 4
  10. 4000
  11. 1
  12. 1089
  13. 2485
  14. 1800
  15. 3
  16. 1111
  17. 10
  18. 2800
  19. 21
  20. 333333333
  21. Wednesday
  22. 9
  23. 35
  24. 8
  25. 15
  26. 55
  27. 162
  28. 36
  29. 84
  30. 13000
  31. 32
  32. 13
  33. 6
  34. 36
  35. Saturday
  36. 36
  37. 6
  38. 59
  39. 49
  40. 861

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