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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 10 · 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. 1.693 + 396 =
  2. 2.9 × 6 =
  3. 3.9 × 4 = ?6 — what is the missing digit?
  4. 4.9 × 6 = 5? — what is the missing digit?
  5. 5.Take 78 and take away the sum of its digits. What do you get?
  6. 6.A piggy bank has 8 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
  7. 7.337? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.9 × 8 = ?2 — what is the missing digit?
  9. 9.?823 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Think of 2. Multiply it by 3, then add 2. What number do you end with?
  11. 11.1 + 2 + 3 + … + 22 =
  12. 12.Magic square (every row, column and diagonal has the same total): 9 14 7 | 8 10 12 | ? 6 11. What is the missing number?
  13. 13.Magic square (every row, column and diagonal has the same total): 15 12 27 | ? 18 6 | 9 24 21. What is the missing number?
  14. 14.12345679 × 81 =
  15. 15.12345 × 8 + 5 =
  16. 16.9 × 1 =
  17. 17.1 + 2 + 3 + … + 48 =
  18. 18.Magic square (every row, column and diagonal has the same total): 10 15 8 | ? 11 13 | 14 7 12. What is the missing number?
  19. 19.1 + 3 + 5 + … + 21 =
  20. 20.Do the 1089 trick with 941: reverse and subtract, then reverse that answer and add. What do you get?
  21. 21.10 × 9 =
  22. 22.9 × 8 =
  23. 23.1234 × 8 + 4 =
  24. 24.Half of 174 =
  25. 25.Odd one out: which number is NOT in the 8 times table? (a) 63 (b) 32 (c) 48 (d) 40
  26. 26.Magic square (every row, column and diagonal has the same total): 17 27 13 | 15 19 ? | 25 11 21. What is the missing number?
  27. 27.5?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 486. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  29. 29.Odd one out: which number is NOT in the 7 times table? (a) 56 (b) 55 (c) 28 (d) 49
  30. 30.Magic square (every row, column and diagonal has the same total): 8 3 10 | 9 ? 5 | 4 11 6. What is the missing number?
  31. 31.13?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.If today is Thursday, what day will it be after 64 days? (a) Saturday (b) Thursday (c) Monday (d) Friday
  33. 33.45 × 100 =
  34. 34.46 × 4 =
  35. 35.11111 × 11111 =
  36. 36.9 × 9 = 8? — what is the missing digit?
  37. 37.1 + 2 + 3 + … + 10 =
  38. 38.Take 65 and take away the sum of its digits. What do you get?
  39. 39.Do the 1089 trick with 620: reverse and subtract, then reverse that answer and add. What do you get?
  40. 40.Take 57 and take away the sum of its digits. What do you get?

Answer key

  1. 1089
  2. 54
  3. 3
  4. 4
  5. 63
  6. 68
  7. 5
  8. 7
  9. 5
  10. 8
  11. 253
  12. 13
  13. 30
  14. 999999999
  15. 98765
  16. 9
  17. 1176
  18. 9
  19. 121
  20. 1089
  21. 90
  22. 72
  23. 9876
  24. 87
  25. 63
  26. 23
  27. 5
  28. 198
  29. 55
  30. 7
  31. 5
  32. Friday
  33. 4500
  34. 184
  35. 123454321
  36. 1
  37. 55
  38. 54
  39. 1089
  40. 45

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