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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 491 · 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.Double 39 =
  2. 2.51 × 4 =
  3. 3.Double 96 =
  4. 4.18 × 4 =
  5. 5.The 1st of a month is a Thursday. What day is the 18th of the same month? (a) Wednesday (b) Monday (c) Saturday (d) Sunday
  6. 6.Magic square (every row, column and diagonal has the same total): 16 ? 10 | 13 19 25 | 28 7 22. What is the missing number?
  7. 7.Double 62 =
  8. 8.29?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.82 × 100 =
  10. 10.1 + 2 + 3 + … + 81 =
  11. 11.36 × 4 =
  12. 12.20 × 4 =
  13. 13.9 × 2 = 1? — what is the missing digit?
  14. 14.10 × 1000 =
  15. 15.469? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.Take 771. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  17. 17.Half of 146 =
  18. 18.What comes next? 15, 23, 31, 39, ? (a) 48 (b) 39 (c) 47 (d) 55
  19. 19.What comes next? 10, 13, 16, 19, ? (a) 22 (b) 23 (c) 25 (d) 19
  20. 20.10 × 9 =
  21. 21.Odd one out: which number is NOT in the 3 times table? (a) 15 (b) 20 (c) 6 (d) 9
  22. 22.Take 14 and take away the sum of its digits. What do you get?
  23. 23.What comes next? 1, 4, 9, 16, ? (a) 26 (b) 23 (c) 25 (d) 27
  24. 24.11 × 11 =
  25. 25.I thought of a number, added 4 and then doubled it. I got 30. What was my number?
  26. 26.Double 58 =
  27. 27.Take 446. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  28. 28.I thought of a number, added 2 and then doubled it. I got 40. What was my number?
  29. 29.Double 37 =
  30. 30.1 + 3 + 5 + … + 45 =
  31. 31.50 × ? = 500
  32. 32.3 × 9 =
  33. 33.9 × 6 = 5? — what is the missing digit?
  34. 34.A piggy bank has 12 coins of ₹5 and 4 coins of ₹2. How many rupees are in it?
  35. 35.Double 65 =
  36. 36.Take 193. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  37. 37.237 × 10 =
  38. 38.1234 × 8 + 4 =
  39. 39.3 × 1000 =
  40. 40.1 + 2 + 3 + … + 33 =

Answer key

  1. 78
  2. 204
  3. 192
  4. 72
  5. Sunday
  6. 31
  7. 124
  8. 2
  9. 8200
  10. 3321
  11. 144
  12. 80
  13. 8
  14. 10000
  15. 8
  16. 594
  17. 73
  18. 47
  19. 22
  20. 90
  21. 20
  22. 9
  23. 25
  24. 121
  25. 11
  26. 116
  27. 198
  28. 18
  29. 74
  30. 529
  31. 10
  32. 27
  33. 4
  34. 68
  35. 130
  36. 198
  37. 2370
  38. 9876
  39. 3000
  40. 561

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