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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 501 · 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.The ages of two twins add up to 8. How old is each twin?
  2. 2.10 × 1000 =
  3. 3.83?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.23 × 100 =
  5. 5.Magic square (every row, column and diagonal has the same total): 15 10 17 | ? 14 12 | 11 18 13. What is the missing number?
  6. 6.Magic square (every row, column and diagonal has the same total): 21 ? 13 | 11 19 27 | 25 15 17. What is the missing number?
  7. 7.578? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.1 + 3 + 5 + … + 9 =
  9. 9.Odd one out: which number is NOT in the 5 times table? (a) 30 (b) 31 (c) 20 (d) 45
  10. 10.297 + 792 =
  11. 11.1 + 2 + 3 + … + 62 =
  12. 12.Double 87 =
  13. 13.Magic trick! Think of 19. Double it, add 8, halve it, then take away 19. What number do you get?
  14. 14.9 × 7 = 6? — what is the missing digit?
  15. 15.396 + 693 =
  16. 16.672 × ? = 6720
  17. 17.54 × 4 =
  18. 18.1 × 9 =
  19. 19.Take 37 and take away the sum of its digits. What do you get?
  20. 20.37 × 18 =
  21. 21.What comes next? 7, 10, 13, 16, ? (a) 19 (b) 20 (c) 16 (d) 22
  22. 22.I thought of a number, added 5 and then doubled it. I got 18. What was my number?
  23. 23.1 + 3 + 5 + … + 37 =
  24. 24.35 × 4 =
  25. 25.Magic square (every row, column and diagonal has the same total): 9 19 17 | 23 15 7 | ? 11 21. What is the missing number?
  26. 26.Half of 46 =
  27. 27.Half of 104 =
  28. 28.The ages of two twins add up to 14. How old is each twin?
  29. 29.Magic square (every row, column and diagonal has the same total): 15 10 17 | 16 14 12 | ? 18 13. What is the missing number?
  30. 30.9 × 6 = ?4 — what is the missing digit?
  31. 31.7 × 100 =
  32. 32.Double 31 =
  33. 33.I thought of a number, multiplied it by 5 and added 2. I got 17. What was my number?
  34. 34.Magic trick! Think of 7. Double it, add 12, halve it, then take away 7. What number do you get?
  35. 35.10?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.6 × 9 =
  37. 37.If today is Monday, what day will it be after 89 days? (a) Tuesday (b) Friday (c) Saturday (d) Sunday
  38. 38.49 × ? = 49000
  39. 39.495 + 594 =
  40. 40.Double 78 =

Answer key

  1. 4
  2. 10000
  3. 5
  4. 2300
  5. 16
  6. 23
  7. 7
  8. 25
  9. 31
  10. 1089
  11. 1953
  12. 174
  13. 4
  14. 3
  15. 1089
  16. 10
  17. 216
  18. 9
  19. 27
  20. 666
  21. 19
  22. 4
  23. 361
  24. 140
  25. 13
  26. 23
  27. 52
  28. 7
  29. 11
  30. 5
  31. 700
  32. 62
  33. 3
  34. 6
  35. 8
  36. 54
  37. Saturday
  38. 1000
  39. 1089
  40. 156

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