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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 152 · 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 × 8 = 7? — what is the missing digit?
  2. 2.791 × 10 =
  3. 3.4 × 9 =
  4. 4.53 × 4 =
  5. 5.A girl is 7 years old and her brother is 4 years older. How old will her brother be in 2 years?
  6. 6.1 + 3 + 5 + … + 27 =
  7. 7.Half of 192 =
  8. 8.What comes next? 1, 2, 4, 8, ? (a) 16 (b) 14 (c) 12 (d) 17
  9. 9.12345679 × 18 =
  10. 10.1 + 2 + 3 + … + 20 =
  11. 11.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  12. 12.9 × 5 = 4? — what is the missing digit?
  13. 13.12345679 × 81 =
  14. 14.Double 86 =
  15. 15.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  16. 16.1 × 9 =
  17. 17.36 × ? = 3600
  18. 18.12345679 × 45 =
  19. 19.9 × 8 =
  20. 20.12 × 4 =
  21. 21.Magic square (every row, column and diagonal has the same total): 8 23 20 | 29 17 5 | 14 11 ?. What is the missing number?
  22. 22.7 × 4 =
  23. 23.48 × 10 =
  24. 24.1234 × 8 + 4 =
  25. 25.Magic square (every row, column and diagonal has the same total): 10 15 8 | ? 11 13 | 14 7 12. What is the missing number?
  26. 26.9 × 4 = 3? — what is the missing digit?
  27. 27.Magic square (every row, column and diagonal has the same total): 18 21 6 | 3 15 27 | 24 ? 12. What is the missing number?
  28. 28.693 + 396 =
  29. 29.Magic square (every row, column and diagonal has the same total): 6 5 10 | 11 7 ? | 4 9 8. What is the missing number?
  30. 30.Take 37 and take away the sum of its digits. What do you get?
  31. 31.13 × 4 =
  32. 32.Magic square (every row, column and diagonal has the same total): 5 19 9 | 15 11 ? | 13 3 17. What is the missing number?
  33. 33.If today is Friday, what day will it be after 13 days? (a) Friday (b) Sunday (c) Thursday (d) Wednesday
  34. 34.6 × 4 =
  35. 35.3 × 9 =
  36. 36.14 × 4 =
  37. 37.226? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.37 × 1000 =
  39. 39.?98 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.What comes next? 17, 23, 29, 35, ? (a) 41 (b) 47 (c) 42 (d) 35

Answer key

  1. 2
  2. 7910
  3. 36
  4. 212
  5. 13
  6. 196
  7. 96
  8. 16
  9. 222222222
  10. 210
  11. 891
  12. 5
  13. 999999999
  14. 172
  15. 198
  16. 9
  17. 100
  18. 555555555
  19. 72
  20. 48
  21. 26
  22. 28
  23. 480
  24. 9876
  25. 9
  26. 6
  27. 9
  28. 1089
  29. 3
  30. 27
  31. 52
  32. 7
  33. Thursday
  34. 24
  35. 27
  36. 56
  37. 8
  38. 37000
  39. 1
  40. 41

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