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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 456 · 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. 1.1 + 2 + 3 + … + 29 =
  2. 2.9 × 10 =
  3. 3.44 × ? = 4400
  4. 4.Magic square (every row, column and diagonal has the same total): 18 33 12 | 15 21 27 | ? 9 24. What is the missing number?
  5. 5.Double 16 =
  6. 6.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 70 (c) 81 (d) 80
  7. 7.If today is Thursday, what day was it 31 days ago? (a) Tuesday (b) Thursday (c) Sunday (d) Monday
  8. 8.8?47 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 629. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  10. 10.What comes next? 4, 13, 22, 31, ? (a) 41 (b) 31 (c) 49 (d) 40
  11. 11.Magic square (every row, column and diagonal has the same total): 9 7 17 | 19 ? 3 | 5 15 13. What is the missing number?
  12. 12.Double 97 =
  13. 13.Half of 198 =
  14. 14.594 + 495 =
  15. 15.Magic trick! Think of 20. Double it, add 10, halve it, then take away 20. What number do you get?
  16. 16.Magic square (every row, column and diagonal has the same total): 21 ? 17 | 11 15 19 | 13 23 9. What is the missing number?
  17. 17.43 × ? = 43000
  18. 18.The 4th of a month is a Tuesday. What day is the 26th of the same month? (a) Wednesday (b) Thursday (c) Saturday (d) Tuesday
  19. 19.297 + 792 =
  20. 20.A father is 35 years old and his son is 6. How old was the father when the son was born?
  21. 21.8 × ? = 800
  22. 22.Take 30 and take away the sum of its digits. What do you get?
  23. 23.27 × 4 =
  24. 24.9 × 5 = ?5 — what is the missing digit?
  25. 25.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹9. How many ₹2 coins do you have?
  26. 26.Double 74 =
  27. 27.?264 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.123 × 9 + 4 =
  29. 29.1 × 9 =
  30. 30.9 × 10 = ?0 — what is the missing digit?
  31. 31.1 + 2 + 3 + … + 35 =
  32. 32.Magic square (every row, column and diagonal has the same total): 19 5 15 | 9 13 17 | 11 ? 7. What is the missing number?
  33. 33.1234567 × 9 + 8 =
  34. 34.Magic square (every row, column and diagonal has the same total): 17 15 ? | 27 19 11 | 13 23 21. What is the missing number?
  35. 35.51 × 4 =
  36. 36.57 × 4 =
  37. 37.Double 24 =
  38. 38.9 × 3 = 2? — what is the missing digit?
  39. 39.The 3rd of a month is a Wednesday. What day is the 16th of the same month? (a) Friday (b) Tuesday (c) Monday (d) Wednesday
  40. 40.41 × 1000 =

Answer key

  1. 435
  2. 90
  3. 100
  4. 30
  5. 32
  6. 80
  7. Monday
  8. 8
  9. 297
  10. 40
  11. 11
  12. 194
  13. 99
  14. 1089
  15. 5
  16. 7
  17. 1000
  18. Wednesday
  19. 1089
  20. 29
  21. 100
  22. 27
  23. 108
  24. 4
  25. 2
  26. 148
  27. 6
  28. 1111
  29. 9
  30. 9
  31. 630
  32. 21
  33. 11111111
  34. 25
  35. 204
  36. 228
  37. 48
  38. 7
  39. Tuesday
  40. 41000

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