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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 330 · 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.Magic square (every row, column and diagonal has the same total): 29 8 23 | 14 20 26 | ? 32 11. What is the missing number?
  2. 2.1 + 2 + 3 + … + 74 =
  3. 3.28 × 4 =
  4. 4.What comes next? 9, 12, 15, 18, ? (a) 21 (b) 22 (c) 18 (d) 24
  5. 5.17 × ? = 17000
  6. 6.Magic square (every row, column and diagonal has the same total): 7 17 ? | 21 13 5 | 11 9 19. What is the missing number?
  7. 7.519? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.1 + 3 + 5 + … + 21 =
  9. 9.Double 71 =
  10. 10.Take 35 and take away the sum of its digits. What do you get?
  11. 11.4 × ? = 4000
  12. 12.15 × 4 =
  13. 13.9 × 1000 =
  14. 14.What comes next? 8, 16, 24, 32, ? (a) 32 (b) 48 (c) 41 (d) 40
  15. 15.If today is Wednesday, what day will it be after 45 days? (a) Friday (b) Tuesday (c) Sunday (d) Saturday
  16. 16.410 × 10 =
  17. 17.A girl is 6 years old and her brother is 4 years older. How old will her brother be in 2 years?
  18. 18.1 + 2 + 3 + … + 60 =
  19. 19.Double 84 =
  20. 20.Do the 1089 trick with 960: reverse and subtract, then reverse that answer and add. What do you get?
  21. 21.9 × 5 = 4? — what is the missing digit?
  22. 22.1 + 2 + 3 + … + 85 =
  23. 23.9 × 2 =
  24. 24.9 × 10 = 9? — what is the missing digit?
  25. 25.12345679 × 18 =
  26. 26.Double 67 =
  27. 27.Magic square (every row, column and diagonal has the same total): 20 5 ? | 23 17 11 | 8 29 14. What is the missing number?
  28. 28.Odd one out: which number is NOT in the 9 times table? (a) 72 (b) 37 (c) 36 (d) 54
  29. 29.If today is Friday, what day was it 26 days ago? (a) Monday (b) Sunday (c) Wednesday (d) Saturday
  30. 30.Magic square (every row, column and diagonal has the same total): 7 21 11 | 17 13 ? | 15 5 19. What is the missing number?
  31. 31.11 × 11 =
  32. 32.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹8. How many ₹2 coins do you have?
  33. 33.A girl is 12 years old and her brother is 6 years older. How old will her brother be in 3 years?
  34. 34.1 + 2 + 3 + … + 7 =
  35. 35.52 × 4 =
  36. 36.What comes next? 7, 14, 21, 28, ? (a) 36 (b) 28 (c) 42 (d) 35
  37. 37.36 × 100 =
  38. 38.9 × 7 = 6? — what is the missing digit?
  39. 39.10 × 9 =
  40. 40.The 7th of a month is a Thursday. What day is the 26th of the same month? (a) Friday (b) Monday (c) Wednesday (d) Tuesday

Answer key

  1. 17
  2. 2775
  3. 112
  4. 21
  5. 1000
  6. 15
  7. 3
  8. 121
  9. 142
  10. 27
  11. 1000
  12. 60
  13. 9000
  14. 40
  15. Saturday
  16. 4100
  17. 12
  18. 1830
  19. 168
  20. 1089
  21. 5
  22. 3655
  23. 18
  24. 0
  25. 222222222
  26. 134
  27. 26
  28. 37
  29. Sunday
  30. 9
  31. 121
  32. 2
  33. 21
  34. 28
  35. 208
  36. 35
  37. 3600
  38. 3
  39. 90
  40. Tuesday

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