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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 339 · 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 × 9 =
  2. 2.8 × 9 =
  3. 3.32 × 100 =
  4. 4.Double 57 =
  5. 5.What comes next? 4, 8, 16, 32, ? (a) 48 (b) 56 (c) 64 (d) 65
  6. 6.Do the 1089 trick with 610: reverse and subtract, then reverse that answer and add. What do you get?
  7. 7.If today is Wednesday, what day will it be after 39 days? (a) Sunday (b) Monday (c) Saturday (d) Wednesday
  8. 8.Magic square (every row, column and diagonal has the same total): 11 ? 15 | 21 17 13 | 19 9 23. What is the missing number?
  9. 9.37 × 6 =
  10. 10.Magic square (every row, column and diagonal has the same total): 6 11 10 | ? 9 5 | 8 7 12. What is the missing number?
  11. 11.Take 36 and take away the sum of its digits. What do you get?
  12. 12.20 × 4 =
  13. 13.1 + 2 + 3 + … + 11 =
  14. 14.In 2 years a boy will be 10 years old. How old was he 4 years ago?
  15. 15.9 × 8 = ?2 — what is the missing digit?
  16. 16.The ages of two twins add up to 12. How old is each twin?
  17. 17.693 + 396 =
  18. 18.The ages of two twins add up to 20. How old is each twin?
  19. 19.Magic square (every row, column and diagonal has the same total): 14 35 ? | 29 23 17 | 26 11 32. What is the missing number?
  20. 20.9 × 5 = 4? — what is the missing digit?
  21. 21.Odd one out: which number is NOT in the 8 times table? (a) 34 (b) 48 (c) 24 (d) 40
  22. 22.9 × 6 = 5? — what is the missing digit?
  23. 23.1 + 2 + 3 + … + 16 =
  24. 24.12345679 × 54 =
  25. 25.I thought of a number, multiplied it by 4 and added 2. I got 14. What was my number?
  26. 26.33 × 4 =
  27. 27.A father is 31 years old and his son is 8. How old was the father when the son was born?
  28. 28.Double 98 =
  29. 29.What comes next? 6, 12, 18, 24, ? (a) 24 (b) 36 (c) 30 (d) 31
  30. 30.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹16. How many ₹2 coins do you have?
  31. 31.9 × 5 =
  32. 32.Think of 13. Multiply it by 4, then add 5. What number do you end with?
  33. 33.1 + 2 + 3 + … + 31 =
  34. 34.Do the 1089 trick with 432: reverse and subtract, then reverse that answer and add. What do you get?
  35. 35.37 × 27 =
  36. 36.11 × ? = 11000
  37. 37.I thought of a number, added 2 and then doubled it. I got 28. What was my number?
  38. 38.Odd one out: which number is NOT in the 8 times table? (a) 48 (b) 24 (c) 70 (d) 64
  39. 39.I thought of a number, multiplied it by 5 and added 1. I got 26. What was my number?
  40. 40.Magic square (every row, column and diagonal has the same total): 5 10 3 | ? 6 8 | 9 2 7. What is the missing number?

Answer key

  1. 81
  2. 72
  3. 3200
  4. 114
  5. 64
  6. 1089
  7. Sunday
  8. 25
  9. 222
  10. 13
  11. 27
  12. 80
  13. 66
  14. 4
  15. 7
  16. 6
  17. 1089
  18. 10
  19. 20
  20. 5
  21. 34
  22. 4
  23. 136
  24. 666666666
  25. 3
  26. 132
  27. 23
  28. 196
  29. 30
  30. 4
  31. 45
  32. 57
  33. 496
  34. 1089
  35. 999
  36. 1000
  37. 12
  38. 70
  39. 5
  40. 4

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