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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 207 · 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. 1.90 × 100 =
  2. 2.693 + 396 =
  3. 3.Magic square (every row, column and diagonal has the same total): 2 9 4 | 7 5 3 | 6 ? 8. What is the missing number?
  4. 4.Magic square (every row, column and diagonal has the same total): 11 25 15 | ? 17 13 | 19 9 23. What is the missing number?
  5. 5.Take 75 and take away the sum of its digits. What do you get?
  6. 6.Half of 104 =
  7. 7.Magic trick! Think of 19. Double it, add 16, halve it, then take away 19. What number do you get?
  8. 8.What comes next? 16, 18, 20, 22, ? (a) 25 (b) 22 (c) 26 (d) 24
  9. 9.59?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Half of 42 =
  11. 11.12345678 × 8 + 8 =
  12. 12.9 × 2 = 1? — what is the missing digit?
  13. 13.The ages of two twins add up to 26. How old is each twin?
  14. 14.If today is Saturday, what day will it be after 17 days? (a) Wednesday (b) Monday (c) Friday (d) Tuesday
  15. 15.Double 12 =
  16. 16.Double 54 =
  17. 17.Half of 148 =
  18. 18.52 × 4 =
  19. 19.9 × 3 = 2? — what is the missing digit?
  20. 20.What comes next? 13, 15, 17, 19, ? (a) 22 (b) 21 (c) 23 (d) 19
  21. 21.The 5th of a month is a Sunday. What day is the 25th of the same month? (a) Friday (b) Saturday (c) Sunday (d) Tuesday
  22. 22.198 + 891 =
  23. 23.9 × 10 = 9? — what is the missing digit?
  24. 24.7?96 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Magic square (every row, column and diagonal has the same total): 11 12 7 | ? 10 14 | 13 8 9. What is the missing number?
  26. 26.If today is Tuesday, what day will it be after 29 days? (a) Thursday (b) Wednesday (c) Tuesday (d) Saturday
  27. 27.If today is Monday, what day will it be after 44 days? (a) Thursday (b) Saturday (c) Wednesday (d) Tuesday
  28. 28.76?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.2 × 9 =
  30. 30.I thought of a number, added 1 and then doubled it. I got 10. What was my number?
  31. 31.10 × 9 =
  32. 32.Double 69 =
  33. 33.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 24 (c) 28 (d) 32
  34. 34.997 × ? = 9970
  35. 35.Take 72 and take away the sum of its digits. What do you get?
  36. 36.Magic square (every row, column and diagonal has the same total): 33 18 21 | 12 24 36 | ? 30 15. What is the missing number?
  37. 37.Half of 64 =
  38. 38.7 × 9 =
  39. 39.9 × 3 = ?7 — what is the missing digit?
  40. 40.What comes next? 4, 9, 16, 25, ? (a) 34 (b) 37 (c) 38 (d) 36

Answer key

  1. 9000
  2. 1089
  3. 1
  4. 21
  5. 63
  6. 52
  7. 8
  8. 24
  9. 2
  10. 21
  11. 98765432
  12. 8
  13. 13
  14. Tuesday
  15. 24
  16. 108
  17. 74
  18. 208
  19. 7
  20. 21
  21. Saturday
  22. 1089
  23. 0
  24. 5
  25. 6
  26. Wednesday
  27. Wednesday
  28. 3
  29. 18
  30. 4
  31. 90
  32. 138
  33. 32
  34. 10
  35. 63
  36. 27
  37. 32
  38. 63
  39. 2
  40. 36

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