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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 110 · 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. 1.297 + 792 =
  2. 2.Half of 52 =
  3. 3.67?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.9 × 6 = ?4 — what is the missing digit?
  5. 5.858? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.A girl is 5 years old and her brother is 6 years older. How old will her brother be in 5 years?
  7. 7.9 × 1 =
  8. 8.1 + 3 + 5 + … + 13 =
  9. 9.5 × 9 =
  10. 10.924 × 10 =
  11. 11.Magic square (every row, column and diagonal has the same total): 32 11 26 | 17 23 29 | 20 35 ?. What is the missing number?
  12. 12.A girl is 7 years old and her brother is 2 years older. How old will her brother be in 2 years?
  13. 13.9 × 10 = ?0 — what is the missing digit?
  14. 14.9 × 3 = ?7 — what is the missing digit?
  15. 15.I thought of a number, added 3 and then doubled it. I got 16. What was my number?
  16. 16.37 × 18 =
  17. 17.Magic trick! Think of 2. Double it, add 18, halve it, then take away 2. What number do you get?
  18. 18.If today is Sunday, what day will it be after 90 days? (a) Tuesday (b) Friday (c) Sunday (d) Saturday
  19. 19.Magic square (every row, column and diagonal has the same total): 9 24 21 | 30 18 6 | ? 12 27. What is the missing number?
  20. 20.If today is Monday, what day will it be after 23 days? (a) Tuesday (b) Saturday (c) Wednesday (d) Thursday
  21. 21.If today is Monday, what day was it 25 days ago? (a) Sunday (b) Friday (c) Wednesday (d) Thursday
  22. 22.10 × ? = 1000
  23. 23.9 × 9 =
  24. 24.Odd one out: which number is NOT in the 6 times table? (a) 20 (b) 12 (c) 18 (d) 36
  25. 25.12 × 4 =
  26. 26.1 + 2 + 3 + … + 14 =
  27. 27.314 × 10 =
  28. 28.57 × 4 =
  29. 29.I thought of a number, added 2 and then doubled it. I got 38. What was my number?
  30. 30.198 + 891 =
  31. 31.Take 410. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  32. 32.I thought of a number, multiplied it by 2 and added 3. I got 15. What was my number?
  33. 33.4 × 9 =
  34. 34.Double 35 =
  35. 35.9 × 8 = ?2 — what is the missing digit?
  36. 36.1 + 2 + 3 + … + 98 =
  37. 37.Think of 4. Multiply it by 2, then add 7. What number do you end with?
  38. 38.9 × 8 = 7? — what is the missing digit?
  39. 39.39 × ? = 39000
  40. 40.3?71 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 1089
  2. 26
  3. 5
  4. 5
  5. 6
  6. 16
  7. 9
  8. 49
  9. 45
  10. 9240
  11. 14
  12. 11
  13. 9
  14. 2
  15. 5
  16. 666
  17. 9
  18. Saturday
  19. 15
  20. Wednesday
  21. Thursday
  22. 100
  23. 81
  24. 20
  25. 48
  26. 105
  27. 3140
  28. 228
  29. 17
  30. 1089
  31. 396
  32. 6
  33. 36
  34. 70
  35. 7
  36. 4851
  37. 15
  38. 2
  39. 1000
  40. 7

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