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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 727 · 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 × 5 = ?5 — what is the missing digit?
  2. 2.48 × 10 =
  3. 3.?978 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.9 × 8 = ?2 — what is the missing digit?
  5. 5.9 × 100 =
  6. 6.What comes next? 12, 19, 26, 33, ? (a) 33 (b) 47 (c) 40 (d) 41
  7. 7.95 × 100 =
  8. 8.Magic trick! Think of 3. Double it, add 18, halve it, then take away 3. What number do you get?
  9. 9.What comes next? 20, 29, 38, 47, ? (a) 57 (b) 56 (c) 65 (d) 47
  10. 10.4?0 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 Tuesday, what day was it 49 days ago? (a) Wednesday (b) Monday (c) Tuesday (d) Friday
  12. 12.Magic square (every row, column and diagonal has the same total): 8 3 10 | 9 7 5 | 4 11 ?. What is the missing number?
  13. 13.594 + 495 =
  14. 14.?92 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Double 21 =
  16. 16.891 + 198 =
  17. 17.Take 35 and take away the sum of its digits. What do you get?
  18. 18.1 + 2 + 3 + … + 69 =
  19. 19.What comes next? 19, 26, 33, 40, ? (a) 54 (b) 48 (c) 40 (d) 47
  20. 20.?067 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.42 × 1000 =
  22. 22.9 × 3 = ?7 — what is the missing digit?
  23. 23.37?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Magic square (every row, column and diagonal has the same total): 7 ? 9 | 12 10 8 | 11 6 13. What is the missing number?
  25. 25.9 × 2 =
  26. 26.8?73 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.123456 × 9 + 7 =
  28. 28.11111 × 11111 =
  29. 29.47 × 1000 =
  30. 30.If today is Friday, what day was it 17 days ago? (a) Monday (b) Tuesday (c) Friday (d) Wednesday
  31. 31.Think of 11. Multiply it by 2, then add 9. What number do you end with?
  32. 32.12 × ? = 12000
  33. 33.Take 18 and take away the sum of its digits. What do you get?
  34. 34.If today is Friday, what day will it be after 67 days? (a) Friday (b) Monday (c) Tuesday (d) Wednesday
  35. 35.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
  36. 36.9 × 4 =
  37. 37.9 × 8 = 7? — what is the missing digit?
  38. 38.12345678 × 8 + 8 =
  39. 39.A girl is 11 years old and her brother is 6 years older. How old will her brother be in 2 years?
  40. 40.Take 94 and take away the sum of its digits. What do you get?

Answer key

  1. 4
  2. 480
  3. 3
  4. 7
  5. 900
  6. 40
  7. 9500
  8. 9
  9. 56
  10. 5
  11. Tuesday
  12. 6
  13. 1089
  14. 7
  15. 42
  16. 1089
  17. 27
  18. 2415
  19. 47
  20. 5
  21. 42000
  22. 2
  23. 3
  24. 14
  25. 18
  26. 9
  27. 1111111
  28. 123454321
  29. 47000
  30. Tuesday
  31. 31
  32. 1000
  33. 9
  34. Tuesday
  35. 2
  36. 36
  37. 2
  38. 98765432
  39. 19
  40. 81

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