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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 284 · 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. 1.198 + 891 =
  2. 2.9 × 4 =
  3. 3.23 × 4 =
  4. 4.I thought of a number, added 9 and then doubled it. I got 48. What was my number?
  5. 5.What comes next? 19, 21, 23, 25, ? (a) 25 (b) 29 (c) 28 (d) 27
  6. 6.6 × 9 =
  7. 7.A piggy bank has 10 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
  8. 8.I thought of a number, multiplied it by 4 and added 6. I got 66. What was my number?
  9. 9.Half of 82 =
  10. 10.Take 972. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  11. 11.Half of 112 =
  12. 12.265 × 10 =
  13. 13.?902 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.A girl is 6 years old and her brother is 2 years older. How old will her brother be in 8 years?
  15. 15.14 × ? = 1400
  16. 16.1 + 2 + 3 + … + 27 =
  17. 17.1234 × 9 + 5 =
  18. 18.8?33 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Odd one out: which number is NOT in the 3 times table? (a) 6 (b) 21 (c) 8 (d) 12
  20. 20.Take 71 and take away the sum of its digits. What do you get?
  21. 21.40 × 4 =
  22. 22.11111 × 11111 =
  23. 23.Double 62 =
  24. 24.What comes next? 4, 8, 16, 32, ? (a) 64 (b) 48 (c) 65 (d) 56
  25. 25.1 + 2 + 3 + … + 67 =
  26. 26.If today is Sunday, what day was it 24 days ago? (a) Friday (b) Wednesday (c) Thursday (d) Sunday
  27. 27.Take 63 and take away the sum of its digits. What do you get?
  28. 28.1 + 2 + 3 + … + 81 =
  29. 29.2 × 9 =
  30. 30.If today is Monday, what day was it 41 days ago? (a) Monday (b) Friday (c) Wednesday (d) Tuesday
  31. 31.9 × 4 = 3? — what is the missing digit?
  32. 32.37 × 4 =
  33. 33.661 × 10 =
  34. 34.1111 × 1111 =
  35. 35.Magic square (every row, column and diagonal has the same total): 13 8 9 | 6 10 14 | ? 12 7. What is the missing number?
  36. 36.Double 33 =
  37. 37.8 × 4 =
  38. 38.Half of 88 =
  39. 39.Think of 11. Multiply it by 3, then add 4. What number do you end with?
  40. 40.Magic square (every row, column and diagonal has the same total): 5 19 9 | ? 11 7 | 13 3 17. What is the missing number?

Answer key

  1. 1089
  2. 36
  3. 92
  4. 15
  5. 27
  6. 54
  7. 64
  8. 15
  9. 41
  10. 693
  11. 56
  12. 2650
  13. 7
  14. 16
  15. 100
  16. 378
  17. 11111
  18. 4
  19. 8
  20. 63
  21. 160
  22. 123454321
  23. 124
  24. 64
  25. 2278
  26. Thursday
  27. 54
  28. 3321
  29. 18
  30. Tuesday
  31. 6
  32. 148
  33. 6610
  34. 1234321
  35. 11
  36. 66
  37. 32
  38. 44
  39. 37
  40. 15

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