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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 98 · 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. 1.975 × 10 =
  2. 2.?618 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Think of 11. Multiply it by 2, then add 1. What number do you end with?
  4. 4.The 4th of a month is a Monday. What day is the 23rd of the same month? (a) Friday (b) Tuesday (c) Sunday (d) Saturday
  5. 5.Do the 1089 trick with 673: reverse and subtract, then reverse that answer and add. What do you get?
  6. 6.A girl is 11 years old and her brother is 4 years older. How old will her brother be in 8 years?
  7. 7.I thought of a number, added 5 and then doubled it. I got 38. What was my number?
  8. 8.I thought of a number, multiplied it by 2 and added 3. I got 23. What was my number?
  9. 9.Magic square (every row, column and diagonal has the same total): 19 9 ? | 5 13 21 | 15 17 7. What is the missing number?
  10. 10.?575 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.9 × 6 =
  12. 12.I thought of a number, added 5 and then doubled it. I got 16. What was my number?
  13. 13.58 × 4 =
  14. 14.?302 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.The 4th of a month is a Friday. What day is the 27th of the same month? (a) Monday (b) Wednesday (c) Saturday (d) Sunday
  16. 16.If today is Tuesday, what day was it 22 days ago? (a) Monday (b) Tuesday (c) Sunday (d) Thursday
  17. 17.Half of 196 =
  18. 18.Half of 142 =
  19. 19.Magic square (every row, column and diagonal has the same total): 8 1 6 | 3 5 7 | 4 ? 2. What is the missing number?
  20. 20.?679 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.16?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.12 × ? = 1200
  23. 23.Odd one out: which number is NOT in the 3 times table? (a) 9 (b) 6 (c) 20 (d) 18
  24. 24.9 × 5 =
  25. 25.297 + 792 =
  26. 26.Double 36 =
  27. 27.111111 × 111111 =
  28. 28.9 × 10 = ?0 — what is the missing digit?
  29. 29.9 × 5 = ?5 — what is the missing digit?
  30. 30.26 × 4 =
  31. 31.6 × ? = 6000
  32. 32.Double 12 =
  33. 33.35 × 4 =
  34. 34.969 × ? = 9690
  35. 35.8 × 1000 =
  36. 36.Magic square (every row, column and diagonal has the same total): ? 21 11 | 17 13 9 | 15 5 19. What is the missing number?
  37. 37.9 × 7 = ?3 — what is the missing digit?
  38. 38.A girl is 5 years old and her brother is 4 years older. How old will her brother be in 7 years?
  39. 39.Take 24 and take away the sum of its digits. What do you get?
  40. 40.What comes next? 2, 4, 8, 16, ? (a) 24 (b) 33 (c) 28 (d) 32

Answer key

  1. 9750
  2. 3
  3. 23
  4. Saturday
  5. 1089
  6. 23
  7. 14
  8. 10
  9. 11
  10. 1
  11. 54
  12. 3
  13. 232
  14. 4
  15. Sunday
  16. Monday
  17. 98
  18. 71
  19. 9
  20. 5
  21. 5
  22. 100
  23. 20
  24. 45
  25. 1089
  26. 72
  27. 12345654321
  28. 9
  29. 4
  30. 104
  31. 1000
  32. 24
  33. 140
  34. 10
  35. 8000
  36. 7
  37. 6
  38. 16
  39. 18
  40. 32

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