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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 35 · 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.A father is 31 years old and his son is 4. How old was the father when the son was born?
  2. 2.9 × 7 = 6? — what is the missing digit?
  3. 3.If today is Wednesday, what day will it be after 26 days? (a) Monday (b) Sunday (c) Thursday (d) Tuesday
  4. 4.?197 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.19 × 4 =
  6. 6.Magic square (every row, column and diagonal has the same total): 12 2 16 | 14 10 ? | 4 18 8. What is the missing number?
  7. 7.9 × 5 = ?5 — what is the missing digit?
  8. 8.I thought of a number, multiplied it by 4 and added 4. I got 24. What was my number?
  9. 9.11111 × 11111 =
  10. 10.4 × 9 =
  11. 11.Magic square (every row, column and diagonal has the same total): 12 22 ? | 10 14 18 | 20 6 16. What is the missing number?
  12. 12.If today is Friday, what day will it be after 26 days? (a) Tuesday (b) Wednesday (c) Saturday (d) Thursday
  13. 13.Magic square (every row, column and diagonal has the same total): 13 27 ? | 23 19 15 | 21 11 25. What is the missing number?
  14. 14.Take 246. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  15. 15.What comes next? 2, 4, 8, 16, ? (a) 28 (b) 32 (c) 24 (d) 33
  16. 16.The ages of two twins add up to 16. How old is each twin?
  17. 17.Magic square (every row, column and diagonal has the same total): ? 11 16 | 17 13 9 | 10 15 14. What is the missing number?
  18. 18.Half of 144 =
  19. 19.9 × 7 =
  20. 20.469 × 10 =
  21. 21.1 + 2 + 3 + … + 61 =
  22. 22.9 × 2 =
  23. 23.Magic square (every row, column and diagonal has the same total): 10 31 16 | 25 19 ? | 22 7 28. What is the missing number?
  24. 24.16 × 4 =
  25. 25.Half of 66 =
  26. 26.31?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.37 × 3 =
  28. 28.50 × 4 =
  29. 29.What comes next? 5, 10, 20, 40, ? (a) 80 (b) 81 (c) 70 (d) 60
  30. 30.Take 30 and take away the sum of its digits. What do you get?
  31. 31.9 × 9 =
  32. 32.Take 387. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  33. 33.10?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Half of 74 =
  35. 35.Half of 108 =
  36. 36.1 + 3 + 5 + … + 41 =
  37. 37.37 × 4 =
  38. 38.9 × 8 = ?2 — what is the missing digit?
  39. 39.You have 10 coins. Each coin is ₹1 or ₹2, and together they make ₹18. How many ₹2 coins do you have?
  40. 40.80?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 27
  2. 3
  3. Monday
  4. 1
  5. 76
  6. 6
  7. 4
  8. 5
  9. 123454321
  10. 36
  11. 8
  12. Wednesday
  13. 17
  14. 396
  15. 32
  16. 8
  17. 12
  18. 72
  19. 63
  20. 4690
  21. 1891
  22. 18
  23. 13
  24. 64
  25. 33
  26. 4
  27. 111
  28. 200
  29. 80
  30. 27
  31. 81
  32. 396
  33. 2
  34. 37
  35. 54
  36. 441
  37. 148
  38. 7
  39. 8
  40. 1

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