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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 716 · 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. 1.1 + 2 + 3 + … + 9 =
  2. 2.956 × 10 =
  3. 3.Double 35 =
  4. 4.Take 68 and take away the sum of its digits. What do you get?
  5. 5.6 × 9 =
  6. 6.The ages of two twins add up to 30. How old is each twin?
  7. 7.Take 50 and take away the sum of its digits. What do you get?
  8. 8.Magic square (every row, column and diagonal has the same total): 23 9 19 | 13 17 21 | 15 25 ?. What is the missing number?
  9. 9.What comes next? 36, 49, 64, 81, ? (a) 102 (b) 98 (c) 101 (d) 100
  10. 10.Magic square (every row, column and diagonal has the same total): 11 32 17 | ? 20 14 | 23 8 29. What is the missing number?
  11. 11.704? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.?707 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Think of 5. Multiply it by 2, then add 9. What number do you end with?
  14. 14.In 6 years a boy will be 18 years old. How old was he 2 years ago?
  15. 15.1 + 2 + 3 + … + 30 =
  16. 16.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 17 (c) 12 (d) 16
  17. 17.12345679 × 54 =
  18. 18.8 × 1000 =
  19. 19.A girl is 11 years old and her brother is 2 years older. How old will her brother be in 6 years?
  20. 20.9 × 6 = ?4 — what is the missing digit?
  21. 21.37 × 27 =
  22. 22.Magic square (every row, column and diagonal has the same total): 5 19 9 | ? 11 7 | 13 3 17. What is the missing number?
  23. 23.594 + 495 =
  24. 24.13 × 4 =
  25. 25.Take 588. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  26. 26.1 × 9 =
  27. 27.Double 93 =
  28. 28.12 × 9 + 3 =
  29. 29.1 + 2 + 3 + … + 15 =
  30. 30.747 × ? = 7470
  31. 31.?208 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Odd one out: which number is NOT in the 6 times table? (a) 55 (b) 42 (c) 18 (d) 36
  33. 33.Take 704. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  34. 34.891 + 198 =
  35. 35.4 × 9 =
  36. 36.1 + 2 + 3 + … + 53 =
  37. 37.Magic square (every row, column and diagonal has the same total): 6 ? 8 | 7 5 3 | 2 9 4. What is the missing number?
  38. 38.Double 79 =
  39. 39.9 × 10 = ?0 — what is the missing digit?
  40. 40.9 × 6 =

Answer key

  1. 45
  2. 9560
  3. 70
  4. 54
  5. 54
  6. 15
  7. 45
  8. 11
  9. 100
  10. 26
  11. 7
  12. 4
  13. 19
  14. 10
  15. 465
  16. 16
  17. 666666666
  18. 8000
  19. 19
  20. 5
  21. 999
  22. 15
  23. 1089
  24. 52
  25. 297
  26. 9
  27. 186
  28. 111
  29. 120
  30. 10
  31. 8
  32. 55
  33. 297
  34. 1089
  35. 36
  36. 1431
  37. 1
  38. 158
  39. 9
  40. 54

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