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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 626 · 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.What comes next? 17, 22, 27, 32, ? (a) 37 (b) 38 (c) 32 (d) 42
  2. 2.5 × 9 =
  3. 3.Take 834. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  4. 4.I thought of a number, added 7 and then doubled it. I got 28. What was my number?
  5. 5.12 × 4 =
  6. 6.What comes next? 3, 6, 12, 24, ? (a) 48 (b) 49 (c) 36 (d) 42
  7. 7.9 × 4 =
  8. 8.I thought of a number, added 5 and then doubled it. I got 16. What was my number?
  9. 9.Take 860. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  10. 10.What comes next? 1, 2, 4, 8, ? (a) 16 (b) 14 (c) 17 (d) 12
  11. 11.Magic trick! Think of 13. Double it, add 14, halve it, then take away 13. What number do you get?
  12. 12.10 × 9 =
  13. 13.1 + 2 + 3 + … + 43 =
  14. 14.9 × 7 = 6? — what is the missing digit?
  15. 15.58 × 4 =
  16. 16.39 × ? = 39000
  17. 17.Magic square (every row, column and diagonal has the same total): 12 11 ? | 17 13 9 | 10 15 14. What is the missing number?
  18. 18.What comes next? 7, 10, 13, 16, ? (a) 20 (b) 22 (c) 16 (d) 19
  19. 19.The 6th of a month is a Thursday. What day is the 26th of the same month? (a) Wednesday (b) Tuesday (c) Thursday (d) Saturday
  20. 20.The 1st of a month is a Wednesday. What day is the 10th of the same month? (a) Monday (b) Thursday (c) Friday (d) Saturday
  21. 21.The 9th of a month is a Monday. What day is the 18th of the same month? (a) Wednesday (b) Saturday (c) Thursday (d) Tuesday
  22. 22.84 × 100 =
  23. 23.9 × 9 =
  24. 24.?248 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.The ages of two twins add up to 20. How old is each twin?
  26. 26.Double 11 =
  27. 27.Double 57 =
  28. 28.62?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.9 × 7 = ?3 — what is the missing digit?
  30. 30.28 × 4 =
  31. 31.Double 25 =
  32. 32.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  33. 33.297 + 792 =
  34. 34.46 × 4 =
  35. 35.29 × 1000 =
  36. 36.4 × 9 =
  37. 37.Magic square (every row, column and diagonal has the same total): ? 5 10 | 7 9 11 | 8 13 6. What is the missing number?
  38. 38.37 × 4 =
  39. 39.9 × 2 = 1? — what is the missing digit?
  40. 40.24 × ? = 24000

Answer key

  1. 37
  2. 45
  3. 396
  4. 7
  5. 48
  6. 48
  7. 36
  8. 3
  9. 792
  10. 16
  11. 7
  12. 90
  13. 946
  14. 3
  15. 232
  16. 1000
  17. 16
  18. 19
  19. Wednesday
  20. Friday
  21. Wednesday
  22. 8400
  23. 81
  24. 4
  25. 10
  26. 22
  27. 114
  28. 9
  29. 6
  30. 112
  31. 50
  32. 495
  33. 1089
  34. 184
  35. 29000
  36. 36
  37. 12
  38. 148
  39. 8
  40. 1000

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