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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 511 · 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 × 6 = ?4 — what is the missing digit?
  2. 2.The ages of two twins add up to 28. How old is each twin?
  3. 3.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 49 (c) 50 (d) 51
  4. 4.12345679 × 18 =
  5. 5.9 × 10 =
  6. 6.86 × ? = 8600
  7. 7.10 × 4 =
  8. 8.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  9. 9.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 80 (c) 81 (d) 60
  10. 10.?53 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.If today is Monday, what day will it be after 28 days? (a) Tuesday (b) Thursday (c) Sunday (d) Monday
  12. 12.Double 26 =
  13. 13.Take 76 and take away the sum of its digits. What do you get?
  14. 14.Double 99 =
  15. 15.33 × 4 =
  16. 16.1 + 3 + 5 + … + 39 =
  17. 17.9 × 3 = 2? — what is the missing digit?
  18. 18.1 + 3 + 5 + … + 41 =
  19. 19.Take 93 and take away the sum of its digits. What do you get?
  20. 20.If today is Wednesday, what day was it 17 days ago? (a) Wednesday (b) Saturday (c) Monday (d) Sunday
  21. 21.Double 66 =
  22. 22.Half of 198 =
  23. 23.Double 27 =
  24. 24.Think of 12. Multiply it by 2, then add 8. What number do you end with?
  25. 25.6 × 9 =
  26. 26.8 × 9 =
  27. 27.What comes next? 1, 6, 11, 16, ? (a) 26 (b) 22 (c) 16 (d) 21
  28. 28.792 + 297 =
  29. 29.Take 185. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  30. 30.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  31. 31.A father is 43 years old and his son is 7. How old was the father when the son was born?
  32. 32.Odd one out: which number is NOT in the 4 times table? (a) 33 (b) 12 (c) 36 (d) 24
  33. 33.Odd one out: which number is NOT in the 8 times table? (a) 24 (b) 48 (c) 63 (d) 56
  34. 34.The 6th of a month is a Saturday. What day is the 22nd of the same month? (a) Thursday (b) Tuesday (c) Monday (d) Sunday
  35. 35.Take 760. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  36. 36.What comes next? 12, 15, 18, 21, ? (a) 24 (b) 27 (c) 21 (d) 25
  37. 37.What comes next? 4, 8, 16, 32, ? (a) 48 (b) 56 (c) 65 (d) 64
  38. 38.What comes next? 11, 16, 21, 26, ? (a) 36 (b) 31 (c) 26 (d) 32
  39. 39.20 × 4 =
  40. 40.Do the 1089 trick with 398: reverse and subtract, then reverse that answer and add. What do you get?

Answer key

  1. 5
  2. 14
  3. 49
  4. 222222222
  5. 90
  6. 100
  7. 40
  8. 396
  9. 80
  10. 1
  11. Monday
  12. 52
  13. 63
  14. 198
  15. 132
  16. 400
  17. 7
  18. 441
  19. 81
  20. Sunday
  21. 132
  22. 99
  23. 54
  24. 32
  25. 54
  26. 72
  27. 21
  28. 1089
  29. 396
  30. 297
  31. 36
  32. 33
  33. 63
  34. Monday
  35. 693
  36. 24
  37. 64
  38. 31
  39. 80
  40. 1089

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