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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 82 · 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. 1.2 × ? = 200
  2. 2.351? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.If today is Friday, what day was it 49 days ago? (a) Monday (b) Thursday (c) Friday (d) Saturday
  4. 4.Magic square (every row, column and diagonal has the same total): 13 14 9 | 8 12 16 | 15 10 ?. What is the missing number?
  5. 5.A father is 42 years old and his son is 9. How old was the father when the son was born?
  6. 6.If today is Friday, what day was it 33 days ago? (a) Monday (b) Sunday (c) Saturday (d) Wednesday
  7. 7.9 × 3 =
  8. 8.Half of 62 =
  9. 9.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 42 (c) 36 (d) 48
  10. 10.264 × 10 =
  11. 11.7?84 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.A father is 44 years old and his son is 14. How old was the father when the son was born?
  13. 13.9 × 4 = 3? — what is the missing digit?
  14. 14.A piggy bank has 12 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
  15. 15.9 × 3 = ?7 — what is the missing digit?
  16. 16.?30 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.If today is Thursday, what day will it be after 61 days? (a) Tuesday (b) Friday (c) Monday (d) Wednesday
  18. 18.9 × 2 = 1? — what is the missing digit?
  19. 19.9 × 5 = ?5 — what is the missing digit?
  20. 20.In 5 years a boy will be 14 years old. How old was he 6 years ago?
  21. 21.27 × 1000 =
  22. 22.9 × 8 = 7? — what is the missing digit?
  23. 23.A father is 38 years old and his son is 7. How old was the father when the son was born?
  24. 24.12345 × 8 + 5 =
  25. 25.What comes next? 4, 8, 16, 32, ? (a) 56 (b) 65 (c) 48 (d) 64
  26. 26.Take 69 and take away the sum of its digits. What do you get?
  27. 27.60 × ? = 6000
  28. 28.625 × 10 =
  29. 29.26 × 4 =
  30. 30.1 + 3 + 5 + … + 17 =
  31. 31.1 × 9 =
  32. 32.Take 97 and take away the sum of its digits. What do you get?
  33. 33.10 × ? = 10000
  34. 34.If today is Saturday, what day will it be after 100 days? (a) Sunday (b) Thursday (c) Monday (d) Tuesday
  35. 35.9 × 2 = ?8 — what is the missing digit?
  36. 36.4 × 9 =
  37. 37.Odd one out: which number is NOT in the 9 times table? (a) 27 (b) 58 (c) 63 (d) 45
  38. 38.12345678 × 9 + 9 =
  39. 39.1 + 2 + 3 + … + 27 =
  40. 40.Do the 1089 trick with 147: reverse and subtract, then reverse that answer and add. What do you get?

Answer key

  1. 100
  2. 9
  3. Friday
  4. 11
  5. 33
  6. Sunday
  7. 27
  8. 31
  9. 48
  10. 2640
  11. 8
  12. 30
  13. 6
  14. 86
  15. 2
  16. 6
  17. Tuesday
  18. 8
  19. 4
  20. 3
  21. 27000
  22. 2
  23. 31
  24. 98765
  25. 64
  26. 54
  27. 100
  28. 6250
  29. 104
  30. 81
  31. 9
  32. 81
  33. 1000
  34. Monday
  35. 1
  36. 36
  37. 58
  38. 111111111
  39. 378
  40. 1089

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