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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 769 · 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. 1.1 + 2 + 3 + … + 17 =
  2. 2.Think of 12. Multiply it by 2, then add 5. What number do you end with?
  3. 3.55 × 4 =
  4. 4.Magic square (every row, column and diagonal has the same total): 13 ? 17 | 15 11 7 | 5 19 9. What is the missing number?
  5. 5.4 × 9 =
  6. 6.34 × 4 =
  7. 7.73?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.12 × 4 =
  9. 9.8 × 4 =
  10. 10.Think of 10. Multiply it by 2, then add 2. What number do you end with?
  11. 11.123456789 × 8 + 9 =
  12. 12.1234 × 9 + 5 =
  13. 13.15 × 100 =
  14. 14.What comes next? 6, 10, 14, 18, ? (a) 26 (b) 22 (c) 23 (d) 18
  15. 15.5 × 9 =
  16. 16.Magic square (every row, column and diagonal has the same total): 10 ? 14 | 15 11 7 | 8 13 12. What is the missing number?
  17. 17.416 × 10 =
  18. 18.1 × 9 =
  19. 19.1 + 3 + 5 + … + 41 =
  20. 20.514 × 10 =
  21. 21.Magic square (every row, column and diagonal has the same total): 13 ? 9 | 8 12 16 | 15 10 11. What is the missing number?
  22. 22.6 × 9 =
  23. 23.Take 177. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  24. 24.The 3rd of a month is a Wednesday. What day is the 29th of the same month? (a) Tuesday (b) Sunday (c) Thursday (d) Monday
  25. 25.54 × 4 =
  26. 26.6 × ? = 6000
  27. 27.305 × 10 =
  28. 28.197 × ? = 1970
  29. 29.9 × 8 =
  30. 30.44 × 1000 =
  31. 31.11 × 1000 =
  32. 32.56 × 4 =
  33. 33.17 × 4 =
  34. 34.I thought of a number, multiplied it by 4 and added 5. I got 17. What was my number?
  35. 35.1 + 2 + 3 + … + 40 =
  36. 36.1 + 3 + 5 + … + 25 =
  37. 37.12 × 8 + 2 =
  38. 38.Magic trick! Think of 3. Double it, add 10, halve it, then take away 3. What number do you get?
  39. 39.37 × 18 =
  40. 40.9 × 5 =

Answer key

  1. 153
  2. 29
  3. 220
  4. 3
  5. 36
  6. 136
  7. 7
  8. 48
  9. 32
  10. 22
  11. 987654321
  12. 11111
  13. 1500
  14. 22
  15. 45
  16. 9
  17. 4160
  18. 9
  19. 441
  20. 5140
  21. 14
  22. 54
  23. 594
  24. Monday
  25. 216
  26. 1000
  27. 3050
  28. 10
  29. 72
  30. 44000
  31. 11000
  32. 224
  33. 68
  34. 3
  35. 820
  36. 169
  37. 98
  38. 5
  39. 666
  40. 45

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