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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 745 · 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. 1.111111 × 111111 =
  2. 2.9 × 4 =
  3. 3.Magic square (every row, column and diagonal has the same total): 26 ? 14 | 11 23 35 | 32 17 20. What is the missing number?
  4. 4.49?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.31 × 4 =
  6. 6.9 × 2 =
  7. 7.9 × 4 = ?6 — what is the missing digit?
  8. 8.Think of 4. Multiply it by 2, then add 8. What number do you end with?
  9. 9.In 2 years a boy will be 15 years old. How old was he 3 years ago?
  10. 10.Magic square (every row, column and diagonal has the same total): 11 ? 7 | 4 8 12 | 9 10 5. What is the missing number?
  11. 11.Magic square (every row, column and diagonal has the same total): 13 6 11 | ? 10 12 | 9 14 7. What is the missing number?
  12. 12.394 × 10 =
  13. 13.58 × 100 =
  14. 14.45 × 100 =
  15. 15.2?16 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.22 × 1000 =
  17. 17.A piggy bank has 3 coins of ₹5 and 10 coins of ₹2. How many rupees are in it?
  18. 18.18 × 4 =
  19. 19.Magic square (every row, column and diagonal has the same total): 8 7 12 | 13 9 5 | 6 11 ?. What is the missing number?
  20. 20.Magic square (every row, column and diagonal has the same total): 21 24 9 | 6 ? 30 | 27 12 15. What is the missing number?
  21. 21.6 × 9 =
  22. 22.The 1st of a month is a Monday. What day is the 11th of the same month? (a) Friday (b) Wednesday (c) Sunday (d) Thursday
  23. 23.12 × 9 + 3 =
  24. 24.9 × 8 = 7? — what is the missing digit?
  25. 25.9 × 5 =
  26. 26.9 × 9 =
  27. 27.Think of 2. Multiply it by 4, then add 8. What number do you end with?
  28. 28.Odd one out: which number is NOT in the 5 times table? (a) 45 (b) 20 (c) 41 (d) 35
  29. 29.1 + 2 + 3 + … + 50 =
  30. 30.Double 22 =
  31. 31.7 × 4 =
  32. 32.4 × 9 =
  33. 33.Take 930. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  34. 34.Double 33 =
  35. 35.9 × 10 = ?0 — what is the missing digit?
  36. 36.What comes next? 16, 25, 36, 49, ? (a) 62 (b) 65 (c) 64 (d) 66
  37. 37.1 + 2 + 3 + … + 39 =
  38. 38.41 × 4 =
  39. 39.9 × 3 =
  40. 40.221 × ? = 2210

Answer key

  1. 12345654321
  2. 36
  3. 29
  4. 3
  5. 124
  6. 18
  7. 3
  8. 16
  9. 10
  10. 6
  11. 8
  12. 3940
  13. 5800
  14. 4500
  15. 9
  16. 22000
  17. 35
  18. 72
  19. 10
  20. 18
  21. 54
  22. Thursday
  23. 111
  24. 2
  25. 45
  26. 81
  27. 16
  28. 41
  29. 1275
  30. 44
  31. 28
  32. 36
  33. 891
  34. 66
  35. 9
  36. 64
  37. 780
  38. 164
  39. 27
  40. 10

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