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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 843 · 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 × 3 = 2? — what is the missing digit?
  2. 2.Take 71 and take away the sum of its digits. What do you get?
  3. 3.4?94 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.9 × 4 =
  5. 5.I thought of a number, added 7 and then doubled it. I got 24. What was my number?
  6. 6.17 × 1000 =
  7. 7.12345679 × 45 =
  8. 8.9 × 2 = ?8 — what is the missing digit?
  9. 9.431 × 10 =
  10. 10.17 × 4 =
  11. 11.I thought of a number, added 8 and then doubled it. I got 32. What was my number?
  12. 12.37 × 9 =
  13. 13.16 × 4 =
  14. 14.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  15. 15.Magic square (every row, column and diagonal has the same total): ? 15 17 | 11 19 27 | 21 23 13. What is the missing number?
  16. 16.9 × 4 = ?6 — what is the missing digit?
  17. 17.1 + 3 + 5 + … + 41 =
  18. 18.9 × 2 =
  19. 19.28 × 4 =
  20. 20.What comes next? 36, 49, 64, 81, ? (a) 100 (b) 101 (c) 98 (d) 102
  21. 21.?100 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.9 × 5 = 4? — what is the missing digit?
  23. 23.1 + 3 + 5 + … + 39 =
  24. 24.Take 43 and take away the sum of its digits. What do you get?
  25. 25.Half of 142 =
  26. 26.9 × 4 = 3? — what is the missing digit?
  27. 27.50 × 4 =
  28. 28.I thought of a number, multiplied it by 2 and added 9. I got 17. What was my number?
  29. 29.Magic square (every row, column and diagonal has the same total): 11 ? 15 | 16 12 8 | 9 14 13. What is the missing number?
  30. 30.37 × 10 =
  31. 31.If today is Saturday, what day was it 11 days ago? (a) Tuesday (b) Monday (c) Friday (d) Wednesday
  32. 32.Think of 5. Multiply it by 2, then add 1. What number do you end with?
  33. 33.Magic square (every row, column and diagonal has the same total): 11 6 13 | 12 10 8 | ? 14 9. What is the missing number?
  34. 34.1 + 2 + 3 + … + 77 =
  35. 35.Double 51 =
  36. 36.12 × 4 =
  37. 37.9 × 6 =
  38. 38.The ages of two twins add up to 16. How old is each twin?
  39. 39.Double 91 =
  40. 40.Magic trick! Think of 14. Double it, add 12, halve it, then take away 14. What number do you get?

Answer key

  1. 7
  2. 63
  3. 1
  4. 36
  5. 5
  6. 17000
  7. 555555555
  8. 1
  9. 4310
  10. 68
  11. 8
  12. 333
  13. 64
  14. 792
  15. 25
  16. 3
  17. 441
  18. 18
  19. 112
  20. 100
  21. 8
  22. 5
  23. 400
  24. 36
  25. 71
  26. 6
  27. 200
  28. 4
  29. 10
  30. 370
  31. Tuesday
  32. 11
  33. 7
  34. 3003
  35. 102
  36. 48
  37. 54
  38. 8
  39. 182
  40. 6

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