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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 279 · 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. 1.883? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  3. 3.9 × 10 = 9? — what is the missing digit?
  4. 4.Half of 152 =
  5. 5.9 × 4 =
  6. 6.37 × 9 =
  7. 7.What comes next? 1, 2, 4, 8, ? (a) 16 (b) 17 (c) 12 (d) 14
  8. 8.What comes next? 36, 49, 64, 81, ? (a) 100 (b) 101 (c) 98 (d) 102
  9. 9.The ages of two twins add up to 28. How old is each twin?
  10. 10.Magic square (every row, column and diagonal has the same total): 24 9 12 | 3 15 27 | ? 21 6. What is the missing number?
  11. 11.9 × 9 = 8? — what is the missing digit?
  12. 12.?574 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Magic square (every row, column and diagonal has the same total): 8 9 4 | 3 7 11 | 10 ? 6. What is the missing number?
  14. 14.2 × 9 =
  15. 15.Take 957. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  16. 16.9 × 8 = ?2 — what is the missing digit?
  17. 17.?61 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.15 × 1000 =
  19. 19.12345 × 9 + 6 =
  20. 20.I thought of a number, added 9 and then doubled it. I got 50. What was my number?
  21. 21.I thought of a number, added 2 and then doubled it. I got 14. What was my number?
  22. 22.Magic square (every row, column and diagonal has the same total): 12 7 8 | ? 9 13 | 10 11 6. What is the missing number?
  23. 23.640? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.66 × 100 =
  25. 25.3 × 9 =
  26. 26.1 + 2 + 3 + … + 67 =
  27. 27.Double 31 =
  28. 28.If today is Tuesday, what day was it 41 days ago? (a) Saturday (b) Wednesday (c) Tuesday (d) Thursday
  29. 29.9 × 6 =
  30. 30.If today is Tuesday, what day will it be after 76 days? (a) Sunday (b) Tuesday (c) Monday (d) Thursday
  31. 31.Double 18 =
  32. 32.57 × 100 =
  33. 33.Take 59 and take away the sum of its digits. What do you get?
  34. 34.Magic square (every row, column and diagonal has the same total): 7 6 11 | 12 8 4 | ? 10 9. What is the missing number?
  35. 35.4?87 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.9 × 7 =
  37. 37.1 + 2 + 3 + … + 31 =
  38. 38.5 × 9 =
  39. 39.9 × 7 = ?3 — what is the missing digit?
  40. 40.9 × 2 = ?8 — what is the missing digit?

Answer key

  1. 8
  2. 396
  3. 0
  4. 76
  5. 36
  6. 333
  7. 16
  8. 100
  9. 14
  10. 18
  11. 1
  12. 2
  13. 5
  14. 18
  15. 198
  16. 7
  17. 2
  18. 15000
  19. 111111
  20. 16
  21. 5
  22. 5
  23. 8
  24. 6600
  25. 27
  26. 2278
  27. 62
  28. Wednesday
  29. 54
  30. Monday
  31. 36
  32. 5700
  33. 45
  34. 5
  35. 8
  36. 63
  37. 496
  38. 45
  39. 6
  40. 1

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