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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 50 · 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 =
  2. 2.9 × 9 =
  3. 3.37 × 18 =
  4. 4.988 × ? = 9880
  5. 5.Double 75 =
  6. 6.Odd one out: which number is NOT in the 3 times table? (a) 18 (b) 12 (c) 16 (d) 9
  7. 7.34 × 4 =
  8. 8.A girl is 6 years old and her brother is 5 years older. How old will her brother be in 3 years?
  9. 9.What comes next? 17, 19, 21, 23, ? (a) 27 (b) 25 (c) 26 (d) 23
  10. 10.Magic square (every row, column and diagonal has the same total): ? 14 17 | 8 20 32 | 23 26 11. What is the missing number?
  11. 11.1 + 2 + 3 + … + 87 =
  12. 12.Magic square (every row, column and diagonal has the same total): ? 32 11 | 14 20 26 | 29 8 23. What is the missing number?
  13. 13.9 × 7 = ?3 — what is the missing digit?
  14. 14.A girl is 9 years old and her brother is 3 years older. How old will her brother be in 8 years?
  15. 15.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹18. How many ₹2 coins do you have?
  16. 16.Magic square (every row, column and diagonal has the same total): 16 14 ? | 26 18 10 | 12 22 20. What is the missing number?
  17. 17.Magic square (every row, column and diagonal has the same total): 8 1 6 | 3 ? 7 | 4 9 2. What is the missing number?
  18. 18.Do the 1089 trick with 573: reverse and subtract, then reverse that answer and add. What do you get?
  19. 19.A piggy bank has 10 coins of ₹5 and 4 coins of ₹2. How many rupees are in it?
  20. 20.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹20. How many ₹2 coins do you have?
  21. 21.594 + 495 =
  22. 22.19 × 4 =
  23. 23.In 5 years a boy will be 13 years old. How old was he 6 years ago?
  24. 24.37 × 6 =
  25. 25.9 × 8 = 7? — what is the missing digit?
  26. 26.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 14 (c) 17 (d) 16
  27. 27.Think of 11. Multiply it by 2, then add 9. What number do you end with?
  28. 28.12345679 × 81 =
  29. 29.1 + 2 + 3 + … + 94 =
  30. 30.12345 × 9 + 6 =
  31. 31.Double 11 =
  32. 32.A girl is 7 years old and her brother is 3 years older. How old will her brother be in 5 years?
  33. 33.Magic square (every row, column and diagonal has the same total): 5 ? 13 | 19 11 3 | 9 7 17. What is the missing number?
  34. 34.What comes next? 5, 10, 20, 40, ? (a) 80 (b) 60 (c) 81 (d) 70
  35. 35.In 3 years a boy will be 12 years old. How old was he 3 years ago?
  36. 36.A father is 36 years old and his son is 10. How old was the father when the son was born?
  37. 37.9 × 1 =
  38. 38.2 × 9 =
  39. 39.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 42 (c) 49 (d) 48
  40. 40.15 × 100 =

Answer key

  1. 90
  2. 81
  3. 666
  4. 10
  5. 150
  6. 16
  7. 136
  8. 14
  9. 25
  10. 29
  11. 3828
  12. 17
  13. 6
  14. 20
  15. 5
  16. 24
  17. 5
  18. 1089
  19. 58
  20. 7
  21. 1089
  22. 76
  23. 2
  24. 222
  25. 2
  26. 16
  27. 31
  28. 999999999
  29. 4465
  30. 111111
  31. 22
  32. 15
  33. 15
  34. 80
  35. 6
  36. 26
  37. 9
  38. 18
  39. 48
  40. 1500

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