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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 449 · 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.Think of 6. Multiply it by 2, then add 2. What number do you end with?
  2. 2.7 × 4 =
  3. 3.8 × 9 =
  4. 4.Magic square (every row, column and diagonal has the same total): 18 4 ? | 8 12 16 | 10 20 6. What is the missing number?
  5. 5.932 × 10 =
  6. 6.What comes next? 17, 21, 25, 29, ? (a) 29 (b) 33 (c) 37 (d) 34
  7. 7.I thought of a number, added 9 and then doubled it. I got 26. What was my number?
  8. 8.9 × 3 =
  9. 9.Magic square (every row, column and diagonal has the same total): 14 ? 10 | 9 13 17 | 16 11 12. What is the missing number?
  10. 10.38 × 4 =
  11. 11.Magic square (every row, column and diagonal has the same total): 13 34 19 | 28 22 16 | 25 ? 31. What is the missing number?
  12. 12.I thought of a number, added 2 and then doubled it. I got 16. What was my number?
  13. 13.Double 37 =
  14. 14.11 × 11 =
  15. 15.90 × 100 =
  16. 16.Magic square (every row, column and diagonal has the same total): 8 9 ? | 3 7 11 | 10 5 6. What is the missing number?
  17. 17.9 × 10 =
  18. 18.9 × 4 =
  19. 19.Magic square (every row, column and diagonal has the same total): 7 2 9 | 8 6 4 | 3 10 ?. What is the missing number?
  20. 20.1 × 9 =
  21. 21.792? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?754 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Magic square (every row, column and diagonal has the same total): 15 ? 7 | 5 13 21 | 19 9 11. What is the missing number?
  24. 24.8 × 1000 =
  25. 25.I thought of a number, added 4 and then doubled it. I got 32. What was my number?
  26. 26.9 × 2 =
  27. 27.If today is Sunday, what day will it be after 46 days? (a) Wednesday (b) Thursday (c) Sunday (d) Friday
  28. 28.396 + 693 =
  29. 29.Take 20 and take away the sum of its digits. What do you get?
  30. 30.Magic square (every row, column and diagonal has the same total): 4 9 2 | 3 5 ? | 8 1 6. What is the missing number?
  31. 31.60 × 100 =
  32. 32.433 × ? = 4330
  33. 33.Magic square (every row, column and diagonal has the same total): 24 3 18 | 9 ? 21 | 12 27 6. What is the missing number?
  34. 34.14 × 10 =
  35. 35.1 + 2 + 3 + … + 45 =
  36. 36.Take 32 and take away the sum of its digits. What do you get?
  37. 37.37 × 9 =
  38. 38.What comes next? 36, 49, 64, 81, ? (a) 101 (b) 100 (c) 102 (d) 98
  39. 39.A father is 36 years old and his son is 4. How old was the father when the son was born?
  40. 40.A father is 40 years old and his son is 10. How old was the father when the son was born?

Answer key

  1. 14
  2. 28
  3. 72
  4. 14
  5. 9320
  6. 33
  7. 4
  8. 27
  9. 15
  10. 152
  11. 10
  12. 6
  13. 74
  14. 121
  15. 9000
  16. 4
  17. 90
  18. 36
  19. 5
  20. 9
  21. 9
  22. 2
  23. 17
  24. 8000
  25. 12
  26. 18
  27. Thursday
  28. 1089
  29. 18
  30. 7
  31. 6000
  32. 10
  33. 15
  34. 140
  35. 1035
  36. 27
  37. 333
  38. 100
  39. 32
  40. 30

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