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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 367 · 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. 1.9 × 10 = ?0 — what is the missing digit?
  2. 2.28 × 1000 =
  3. 3.If today is Wednesday, what day was it 10 days ago? (a) Monday (b) Sunday (c) Saturday (d) Wednesday
  4. 4.10 × 9 =
  5. 5.9 × 2 = 1? — what is the missing digit?
  6. 6.9 × 5 = ?5 — what is the missing digit?
  7. 7.Double 92 =
  8. 8.If today is Wednesday, what day was it 41 days ago? (a) Wednesday (b) Sunday (c) Friday (d) Thursday
  9. 9.53 × ? = 5300
  10. 10.9 × 4 = ?6 — what is the missing digit?
  11. 11.50 × 4 =
  12. 12.9 × 9 =
  13. 13.In 6 years a boy will be 15 years old. How old was he 3 years ago?
  14. 14.Odd one out: which number is NOT in the 4 times table? (a) 12 (b) 24 (c) 16 (d) 14
  15. 15.What comes next? 15, 20, 25, 30, ? (a) 40 (b) 30 (c) 35 (d) 36
  16. 16.1 + 3 + 5 + … + 23 =
  17. 17.724 × 10 =
  18. 18.A girl is 9 years old and her brother is 5 years older. How old will her brother be in 6 years?
  19. 19.594 + 495 =
  20. 20.Magic square (every row, column and diagonal has the same total): 17 7 9 | 3 ? 19 | 13 15 5. What is the missing number?
  21. 21.1 + 3 + 5 + … + 41 =
  22. 22.1 + 3 + 5 + … + 43 =
  23. 23.239? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.12345678 × 8 + 8 =
  25. 25.Magic square (every row, column and diagonal has the same total): 11 9 19 | 21 13 5 | 7 ? 15. What is the missing number?
  26. 26.I thought of a number, multiplied it by 4 and added 3. I got 43. What was my number?
  27. 27.Double 69 =
  28. 28.Magic square (every row, column and diagonal has the same total): ? 8 9 | 6 10 14 | 11 12 7. What is the missing number?
  29. 29.1234 × 8 + 4 =
  30. 30.What comes next? 13, 19, 25, 31, ? (a) 31 (b) 38 (c) 43 (d) 37
  31. 31.A piggy bank has 6 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
  32. 32.9 × 9 = 8? — what is the missing digit?
  33. 33.37 × 4 =
  34. 34.The 4th of a month is a Thursday. What day is the 12th of the same month? (a) Saturday (b) Monday (c) Friday (d) Thursday
  35. 35.Double 46 =
  36. 36.9 × 1 =
  37. 37.36 × 4 =
  38. 38.Think of 11. Multiply it by 5, then add 1. What number do you end with?
  39. 39.Magic square (every row, column and diagonal has the same total): 17 ? 15 | 12 14 16 | 13 18 11. What is the missing number?
  40. 40.9 × 10 =

Answer key

  1. 9
  2. 28000
  3. Sunday
  4. 90
  5. 8
  6. 4
  7. 184
  8. Thursday
  9. 100
  10. 3
  11. 200
  12. 81
  13. 6
  14. 14
  15. 35
  16. 144
  17. 7240
  18. 20
  19. 1089
  20. 11
  21. 441
  22. 484
  23. 4
  24. 98765432
  25. 17
  26. 10
  27. 138
  28. 13
  29. 9876
  30. 37
  31. 60
  32. 1
  33. 148
  34. Friday
  35. 92
  36. 9
  37. 144
  38. 56
  39. 10
  40. 90

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