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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 49 · 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 × 2 = 1? — what is the missing digit?
  2. 2.9 × 4 = 3? — what is the missing digit?
  3. 3.Magic square (every row, column and diagonal has the same total): 19 ? 31 | 34 22 10 | 13 28 25. What is the missing number?
  4. 4.12 × 8 + 2 =
  5. 5.8 × 9 =
  6. 6.Do the 1089 trick with 257: reverse and subtract, then reverse that answer and add. What do you get?
  7. 7.Take 411. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  8. 8.Odd one out: which number is NOT in the 3 times table? (a) 8 (b) 9 (c) 18 (d) 6
  9. 9.If today is Thursday, what day was it 42 days ago? (a) Friday (b) Sunday (c) Thursday (d) Wednesday
  10. 10.466 × ? = 4660
  11. 11.9 × 4 =
  12. 12.Magic square (every row, column and diagonal has the same total): 13 28 7 | 10 16 22 | ? 4 19. What is the missing number?
  13. 13.In 6 years a boy will be 16 years old. How old was he 4 years ago?
  14. 14.62?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 66 and take away the sum of its digits. What do you get?
  16. 16.If today is Wednesday, what day was it 43 days ago? (a) Wednesday (b) Friday (c) Monday (d) Tuesday
  17. 17.Magic square (every row, column and diagonal has the same total): ? 5 10 | 11 7 3 | 4 9 8. What is the missing number?
  18. 18.In 5 years a boy will be 16 years old. How old was he 5 years ago?
  19. 19.78 × 100 =
  20. 20.1 + 2 + 3 + … + 59 =
  21. 21.427 × ? = 4270
  22. 22.31 × 4 =
  23. 23.Double 17 =
  24. 24.1 + 3 + 5 + … + 25 =
  25. 25.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹10. How many ₹2 coins do you have?
  26. 26.Half of 118 =
  27. 27.The 6th of a month is a Friday. What day is the 25th of the same month? (a) Saturday (b) Thursday (c) Tuesday (d) Wednesday
  28. 28.Take 97 and take away the sum of its digits. What do you get?
  29. 29.Take 93 and take away the sum of its digits. What do you get?
  30. 30.9 × 7 = ?3 — what is the missing digit?
  31. 31.The ages of two twins add up to 12. How old is each twin?
  32. 32.What comes next? 3, 6, 12, 24, ? (a) 48 (b) 49 (c) 36 (d) 42
  33. 33.9 × 9 =
  34. 34.50 × ? = 50000
  35. 35.Think of 14. Multiply it by 4, then add 1. What number do you end with?
  36. 36.9 × 10 = 9? — what is the missing digit?
  37. 37.Double 21 =
  38. 38.892 × ? = 8920
  39. 39.1 + 2 + 3 + … + 25 =
  40. 40.111111 × 111111 =

Answer key

  1. 8
  2. 6
  3. 16
  4. 98
  5. 72
  6. 1089
  7. 297
  8. 8
  9. Thursday
  10. 10
  11. 36
  12. 25
  13. 6
  14. 9
  15. 54
  16. Tuesday
  17. 6
  18. 6
  19. 7800
  20. 1770
  21. 10
  22. 124
  23. 34
  24. 169
  25. 1
  26. 59
  27. Wednesday
  28. 81
  29. 81
  30. 6
  31. 6
  32. 48
  33. 81
  34. 1000
  35. 57
  36. 0
  37. 42
  38. 10
  39. 325
  40. 12345654321

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