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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 324 · 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. 1.85 × 100 =
  2. 2.9 × 8 =
  3. 3.9 × 2 = ?8 — what is the missing digit?
  4. 4.What comes next? 4, 9, 16, 25, ? (a) 36 (b) 37 (c) 38 (d) 34
  5. 5.The 5th of a month is a Thursday. What day is the 20th of the same month? (a) Thursday (b) Friday (c) Monday (d) Saturday
  6. 6.1 + 2 + 3 + … + 23 =
  7. 7.The ages of two twins add up to 10. How old is each twin?
  8. 8.Magic square (every row, column and diagonal has the same total): 5 10 3 | 4 6 8 | 9 2 ?. What is the missing number?
  9. 9.Magic trick! Think of 5. Double it, add 8, halve it, then take away 5. What number do you get?
  10. 10.Odd one out: which number is NOT in the 3 times table? (a) 15 (b) 12 (c) 21 (d) 11
  11. 11.Take 178. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  12. 12.8 × ? = 8000
  13. 13.?218 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.1 + 2 + 3 + … + 25 =
  15. 15.50 × ? = 50000
  16. 16.3 × 9 =
  17. 17.37 × 12 =
  18. 18.1 + 3 + 5 + … + 39 =
  19. 19.52?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.294 × 10 =
  21. 21.Magic trick! Think of 4. Double it, add 18, halve it, then take away 4. What number do you get?
  22. 22.5 × 9 =
  23. 23.Magic square (every row, column and diagonal has the same total): 27 12 33 | 30 24 18 | ? 36 21. What is the missing number?
  24. 24.What comes next? 3, 6, 12, 24, ? (a) 42 (b) 48 (c) 36 (d) 49
  25. 25.Magic square (every row, column and diagonal has the same total): 12 7 14 | 13 11 9 | 8 ? 10. What is the missing number?
  26. 26.9 × 3 = 2? — what is the missing digit?
  27. 27.I thought of a number, multiplied it by 4 and added 8. I got 20. What was my number?
  28. 28.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 14 (c) 17 (d) 16
  29. 29.23 × 4 =
  30. 30.9 × 9 = ?1 — what is the missing digit?
  31. 31.I thought of a number, multiplied it by 4 and added 9. I got 65. What was my number?
  32. 32.37 × 9 =
  33. 33.Double 23 =
  34. 34.9 × 8 = 7? — what is the missing digit?
  35. 35.1 + 3 + 5 + … + 37 =
  36. 36.Magic square (every row, column and diagonal has the same total): 10 20 18 | 24 ? 8 | 14 12 22. What is the missing number?
  37. 37.Magic square (every row, column and diagonal has the same total): 14 11 26 | 29 17 5 | 8 ? 20. What is the missing number?
  38. 38.In 4 years a boy will be 13 years old. How old was he 4 years ago?
  39. 39.A girl is 11 years old and her brother is 2 years older. How old will her brother be in 3 years?
  40. 40.Double 62 =

Answer key

  1. 8500
  2. 72
  3. 1
  4. 36
  5. Friday
  6. 276
  7. 5
  8. 7
  9. 4
  10. 11
  11. 693
  12. 1000
  13. 7
  14. 325
  15. 1000
  16. 27
  17. 444
  18. 400
  19. 1
  20. 2940
  21. 9
  22. 45
  23. 15
  24. 48
  25. 15
  26. 7
  27. 3
  28. 16
  29. 92
  30. 8
  31. 14
  32. 333
  33. 46
  34. 2
  35. 361
  36. 16
  37. 23
  38. 5
  39. 16
  40. 124

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