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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 390 · 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.If today is Monday, what day was it 41 days ago? (a) Monday (b) Tuesday (c) Friday (d) Wednesday
  2. 2.23 × 1000 =
  3. 3.Do the 1089 trick with 399: reverse and subtract, then reverse that answer and add. What do you get?
  4. 4.12345679 × 63 =
  5. 5.Magic square (every row, column and diagonal has the same total): 13 11 21 | 23 ? 7 | 9 19 17. What is the missing number?
  6. 6.37 × 4 =
  7. 7.553 × ? = 5530
  8. 8.Magic trick! Think of 5. Double it, add 6, halve it, then take away 5. What number do you get?
  9. 9.Magic square (every row, column and diagonal has the same total): 25 28 13 | 10 22 34 | ? 16 19. What is the missing number?
  10. 10.I thought of a number, multiplied it by 2 and added 1. I got 27. What was my number?
  11. 11.1 + 3 + 5 + … + 19 =
  12. 12.What comes next? 1, 2, 4, 8, ? (a) 17 (b) 14 (c) 12 (d) 16
  13. 13.9 × 3 = 2? — what is the missing digit?
  14. 14.330? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.12 × 4 =
  16. 16.9 × 6 = 5? — what is the missing digit?
  17. 17.Think of 4. Multiply it by 5, then add 2. What number do you end with?
  18. 18.198 + 891 =
  19. 19.Magic trick! Think of 17. Double it, add 12, halve it, then take away 17. What number do you get?
  20. 20.Do the 1089 trick with 348: reverse and subtract, then reverse that answer and add. What do you get?
  21. 21.The 8th of a month is a Monday. What day is the 21st of the same month? (a) Monday (b) Saturday (c) Wednesday (d) Sunday
  22. 22.If today is Sunday, what day was it 30 days ago? (a) Thursday (b) Friday (c) Monday (d) Saturday
  23. 23.9 × 7 =
  24. 24.Magic trick! Think of 15. Double it, add 12, halve it, then take away 15. What number do you get?
  25. 25.Magic square (every row, column and diagonal has the same total): 21 6 27 | 24 18 12 | ? 30 15. What is the missing number?
  26. 26.Double 41 =
  27. 27.The ages of two twins add up to 26. How old is each twin?
  28. 28.9 × 10 = ?0 — what is the missing digit?
  29. 29.Odd one out: which number is NOT in the 5 times table? (a) 15 (b) 30 (c) 19 (d) 25
  30. 30.40 × 4 =
  31. 31.Think of 13. Multiply it by 4, then add 8. What number do you end with?
  32. 32.Take 36 and take away the sum of its digits. What do you get?
  33. 33.9 × 3 =
  34. 34.9 × 5 = 4? — what is the missing digit?
  35. 35.The ages of two twins add up to 10. How old is each twin?
  36. 36.A girl is 6 years old and her brother is 5 years older. How old will her brother be in 6 years?
  37. 37.Take 95 and take away the sum of its digits. What do you get?
  38. 38.1 + 2 + 3 + … + 23 =
  39. 39.Odd one out: which number is NOT in the 9 times table? (a) 81 (b) 36 (c) 19 (d) 54
  40. 40.Half of 148 =

Answer key

  1. Tuesday
  2. 23000
  3. 1089
  4. 777777777
  5. 15
  6. 148
  7. 10
  8. 3
  9. 31
  10. 13
  11. 100
  12. 16
  13. 7
  14. 3
  15. 48
  16. 4
  17. 22
  18. 1089
  19. 6
  20. 1089
  21. Sunday
  22. Friday
  23. 63
  24. 6
  25. 9
  26. 82
  27. 13
  28. 9
  29. 19
  30. 160
  31. 60
  32. 27
  33. 27
  34. 5
  35. 5
  36. 17
  37. 81
  38. 276
  39. 19
  40. 74

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