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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 615 · 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. 1.37 × 24 =
  2. 2.86 × 100 =
  3. 3.31 × ? = 31000
  4. 4.If today is Wednesday, what day will it be after 52 days? (a) Sunday (b) Saturday (c) Friday (d) Tuesday
  5. 5.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹6. How many ₹2 coins do you have?
  6. 6.37 × 100 =
  7. 7.Odd one out: which number is NOT in the 6 times table? (a) 36 (b) 34 (c) 12 (d) 30
  8. 8.9 × 4 = 3? — what is the missing digit?
  9. 9.643? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.9 × 6 = 5? — what is the missing digit?
  11. 11.Magic square (every row, column and diagonal has the same total): 6 5 10 | 11 7 3 | ? 9 8. What is the missing number?
  12. 12.The ages of two twins add up to 26. How old is each twin?
  13. 13.94 × 100 =
  14. 14.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  15. 15.67 × ? = 6700
  16. 16.1 × 9 =
  17. 17.9 × 9 = ?1 — what is the missing digit?
  18. 18.81 × ? = 8100
  19. 19.1 + 3 + 5 + … + 11 =
  20. 20.693 + 396 =
  21. 21.13 × ? = 1300
  22. 22.Take 62 and take away the sum of its digits. What do you get?
  23. 23.87 × 100 =
  24. 24.If today is Sunday, what day was it 39 days ago? (a) Tuesday (b) Wednesday (c) Thursday (d) Saturday
  25. 25.11 × 1000 =
  26. 26.19 × ? = 19000
  27. 27.21 × 1000 =
  28. 28.58 × 4 =
  29. 29.Do the 1089 trick with 420: reverse and subtract, then reverse that answer and add. What do you get?
  30. 30.15 × 4 =
  31. 31.1 + 2 + 3 + … + 28 =
  32. 32.I thought of a number, added 8 and then doubled it. I got 28. What was my number?
  33. 33.Do the 1089 trick with 294: reverse and subtract, then reverse that answer and add. What do you get?
  34. 34.37 × 6 =
  35. 35.36 × 4 =
  36. 36.9 × 5 =
  37. 37.A girl is 11 years old and her brother is 5 years older. How old will her brother be in 8 years?
  38. 38.9 × 8 = 7? — what is the missing digit?
  39. 39.9 × 9 = 8? — what is the missing digit?
  40. 40.If today is Tuesday, what day will it be after 55 days? (a) Thursday (b) Monday (c) Sunday (d) Tuesday

Answer key

  1. 888
  2. 8600
  3. 1000
  4. Saturday
  5. 1
  6. 3700
  7. 34
  8. 6
  9. 5
  10. 4
  11. 4
  12. 13
  13. 9400
  14. 297
  15. 100
  16. 9
  17. 8
  18. 100
  19. 36
  20. 1089
  21. 100
  22. 54
  23. 8700
  24. Wednesday
  25. 11000
  26. 1000
  27. 21000
  28. 232
  29. 1089
  30. 60
  31. 406
  32. 6
  33. 1089
  34. 222
  35. 144
  36. 45
  37. 24
  38. 2
  39. 1
  40. Monday

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