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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 412 · 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. 1.41 × 1000 =
  2. 2.1 + 3 + 5 + … + 9 =
  3. 3.32 × ? = 3200
  4. 4.A piggy bank has 10 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
  5. 5.4 × 9 =
  6. 6.9 × 9 = ?1 — what is the missing digit?
  7. 7.28 × 4 =
  8. 8.44 × 4 =
  9. 9.9 × 6 =
  10. 10.9 × 2 = 1? — what is the missing digit?
  11. 11.Take 430. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  12. 12.9 × 10 = 9? — what is the missing digit?
  13. 13.9 × 9 =
  14. 14.Magic square (every row, column and diagonal has the same total): ? 23 21 | 27 19 11 | 17 15 25. What is the missing number?
  15. 15.Double 99 =
  16. 16.13 × 4 =
  17. 17.3 × 9 =
  18. 18.In 5 years a boy will be 13 years old. How old was he 7 years ago?
  19. 19.37 × 21 =
  20. 20.37 × 24 =
  21. 21.81 × ? = 8100
  22. 22.Half of 176 =
  23. 23.Take 318. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  24. 24.12345678 × 8 + 8 =
  25. 25.Double 61 =
  26. 26.What comes next? 19, 25, 31, 37, ? (a) 44 (b) 49 (c) 43 (d) 37
  27. 27.37 × 18 =
  28. 28.Double 35 =
  29. 29.What comes next? 20, 25, 30, 35, ? (a) 41 (b) 45 (c) 35 (d) 40
  30. 30.A girl is 11 years old and her brother is 5 years older. How old will her brother be in 8 years?
  31. 31.1 + 2 + 3 + … + 60 =
  32. 32.Take 72 and take away the sum of its digits. What do you get?
  33. 33.25 × ? = 2500
  34. 34.A piggy bank has 4 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
  35. 35.Magic square (every row, column and diagonal has the same total): 18 15 30 | ? 21 9 | 12 27 24. What is the missing number?
  36. 36.4?25 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 53 and take away the sum of its digits. What do you get?
  38. 38.1 + 2 + 3 + … + 25 =
  39. 39.9 × 5 =
  40. 40.19 × ? = 19000

Answer key

  1. 41000
  2. 25
  3. 100
  4. 76
  5. 36
  6. 8
  7. 112
  8. 176
  9. 54
  10. 8
  11. 396
  12. 0
  13. 81
  14. 13
  15. 198
  16. 52
  17. 27
  18. 1
  19. 777
  20. 888
  21. 100
  22. 88
  23. 495
  24. 98765432
  25. 122
  26. 43
  27. 666
  28. 70
  29. 40
  30. 24
  31. 1830
  32. 63
  33. 100
  34. 34
  35. 33
  36. 7
  37. 45
  38. 325
  39. 45
  40. 1000

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