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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 617 · 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.I thought of a number, added 2 and then doubled it. I got 10. What was my number?
  2. 2.20 × 1000 =
  3. 3.The ages of two twins add up to 24. How old is each twin?
  4. 4.33 × 4 =
  5. 5.3 × 9 =
  6. 6.If today is Friday, what day will it be after 67 days? (a) Wednesday (b) Friday (c) Monday (d) Tuesday
  7. 7.594 + 495 =
  8. 8.5 × 9 =
  9. 9.?673 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.11 × ? = 1100
  11. 11.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 28 (c) 24 (d) 32
  12. 12.7 × ? = 7000
  13. 13.Half of 98 =
  14. 14.1 + 2 + 3 + … + 37 =
  15. 15.Magic square (every row, column and diagonal has the same total): ? 4 9 | 10 6 2 | 3 8 7. What is the missing number?
  16. 16.Magic square (every row, column and diagonal has the same total): ? 21 11 | 9 17 25 | 23 13 15. What is the missing number?
  17. 17.2 × 9 =
  18. 18.Take 61 and take away the sum of its digits. What do you get?
  19. 19.Take 54 and take away the sum of its digits. What do you get?
  20. 20.What comes next? 16, 22, 28, 34, ? (a) 41 (b) 46 (c) 34 (d) 40
  21. 21.33?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.1 + 2 + 3 + … + 19 =
  23. 23.Take 58 and take away the sum of its digits. What do you get?
  24. 24.88 × 100 =
  25. 25.Odd one out: which number is NOT in the 6 times table? (a) 30 (b) 18 (c) 43 (d) 12
  26. 26.37 × 21 =
  27. 27.66 × 100 =
  28. 28.Take 278. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  29. 29.9 × 4 = ?6 — what is the missing digit?
  30. 30.12345678 × 9 + 9 =
  31. 31.What comes next? 4, 9, 16, 25, ? (a) 36 (b) 37 (c) 34 (d) 38
  32. 32.Think of 5. Multiply it by 5, then add 7. What number do you end with?
  33. 33.Magic trick! Think of 5. Double it, add 10, halve it, then take away 5. What number do you get?
  34. 34.9 × 6 = ?4 — what is the missing digit?
  35. 35.9 × 1 =
  36. 36.What comes next? 25, 36, 49, 64, ? (a) 82 (b) 81 (c) 83 (d) 79
  37. 37.The 6th of a month is a Monday. What day is the 22nd of the same month? (a) Tuesday (b) Wednesday (c) Saturday (d) Thursday
  38. 38.371 × 10 =
  39. 39.1?72 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Magic square (every row, column and diagonal has the same total): ? 13 6 | 7 9 11 | 12 5 10. What is the missing number?

Answer key

  1. 3
  2. 20000
  3. 12
  4. 132
  5. 27
  6. Tuesday
  7. 1089
  8. 45
  9. 2
  10. 100
  11. 32
  12. 1000
  13. 49
  14. 703
  15. 5
  16. 19
  17. 18
  18. 54
  19. 45
  20. 40
  21. 5
  22. 190
  23. 45
  24. 8800
  25. 43
  26. 777
  27. 6600
  28. 594
  29. 3
  30. 111111111
  31. 36
  32. 32
  33. 5
  34. 5
  35. 9
  36. 81
  37. Wednesday
  38. 3710
  39. 8
  40. 8

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