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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 774 · 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 × 10 = 9? — what is the missing digit?
  2. 2.123 × 9 + 4 =
  3. 3.Half of 72 =
  4. 4.21 × 4 =
  5. 5.The ages of two twins add up to 24. How old is each twin?
  6. 6.Take 13 and take away the sum of its digits. What do you get?
  7. 7.382? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.297 + 792 =
  9. 9.If today is Saturday, what day was it 27 days ago? (a) Monday (b) Sunday (c) Saturday (d) Wednesday
  10. 10.Take 49 and take away the sum of its digits. What do you get?
  11. 11.35 × 4 =
  12. 12.What comes next? 14, 18, 22, 26, ? (a) 31 (b) 34 (c) 26 (d) 30
  13. 13.Take 562. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  14. 14.56 × ? = 5600
  15. 15.If today is Thursday, what day was it 48 days ago? (a) Saturday (b) Friday (c) Thursday (d) Monday
  16. 16.Magic square (every row, column and diagonal has the same total): 22 7 28 | 25 ? 13 | 10 31 16. What is the missing number?
  17. 17.902 × 10 =
  18. 18.Double 18 =
  19. 19.Take 11 and take away the sum of its digits. What do you get?
  20. 20.What comes next? 10, 12, 14, 16, ? (a) 16 (b) 20 (c) 18 (d) 19
  21. 21.A father is 45 years old and his son is 5. How old was the father when the son was born?
  22. 22.9 × 1 =
  23. 23.Magic trick! Think of 5. Double it, add 6, halve it, then take away 5. What number do you get?
  24. 24.Magic square (every row, column and diagonal has the same total): 15 30 27 | 36 24 12 | 21 18 ?. What is the missing number?
  25. 25.1 + 2 + 3 + … + 90 =
  26. 26.19 × 1000 =
  27. 27.The 8th of a month is a Friday. What day is the 27th of the same month? (a) Thursday (b) Saturday (c) Tuesday (d) Wednesday
  28. 28.Magic square (every row, column and diagonal has the same total): 19 5 15 | ? 13 17 | 11 21 7. What is the missing number?
  29. 29.?895 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Half of 192 =
  31. 31.46 × 10 =
  32. 32.What comes next? 11, 19, 27, 35, ? (a) 44 (b) 43 (c) 35 (d) 51
  33. 33.If today is Wednesday, what day will it be after 90 days? (a) Friday (b) Wednesday (c) Tuesday (d) Monday
  34. 34.12 × 4 =
  35. 35.6 × 9 =
  36. 36.Do the 1089 trick with 402: reverse and subtract, then reverse that answer and add. What do you get?
  37. 37.3 × 9 =
  38. 38.9 × 7 = ?3 — what is the missing digit?
  39. 39.Half of 34 =
  40. 40.9 × 5 =

Answer key

  1. 0
  2. 1111
  3. 36
  4. 84
  5. 12
  6. 9
  7. 5
  8. 1089
  9. Sunday
  10. 36
  11. 140
  12. 30
  13. 297
  14. 100
  15. Friday
  16. 19
  17. 9020
  18. 36
  19. 9
  20. 18
  21. 40
  22. 9
  23. 3
  24. 33
  25. 4095
  26. 19000
  27. Wednesday
  28. 9
  29. 5
  30. 96
  31. 460
  32. 43
  33. Tuesday
  34. 48
  35. 54
  36. 1089
  37. 27
  38. 6
  39. 17
  40. 45

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