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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 735 · 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.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  2. 2.64?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Double 97 =
  4. 4.37 × 21 =
  5. 5.22 × 4 =
  6. 6.891 + 198 =
  7. 7.37 × 4 =
  8. 8.A piggy bank has 5 coins of ₹5 and 4 coins of ₹2. How many rupees are in it?
  9. 9.9 × 8 =
  10. 10.Magic square (every row, column and diagonal has the same total): ? 10 31 | 28 22 16 | 13 34 19. What is the missing number?
  11. 11.Take 97 and take away the sum of its digits. What do you get?
  12. 12.Take 709. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  13. 13.879? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Half of 22 =
  15. 15.1 + 2 + 3 + … + 23 =
  16. 16.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  17. 17.A piggy bank has 3 coins of ₹5 and 8 coins of ₹2. How many rupees are in it?
  18. 18.9 × 9 = ?1 — what is the missing digit?
  19. 19.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
  20. 20.3 × 9 =
  21. 21.Double 16 =
  22. 22.9 × 3 = ?7 — what is the missing digit?
  23. 23.Half of 74 =
  24. 24.I thought of a number, multiplied it by 2 and added 9. I got 23. What was my number?
  25. 25.9 × 5 = ?5 — what is the missing digit?
  26. 26.9 × 6 = 5? — what is the missing digit?
  27. 27.6 × 9 =
  28. 28.What comes next? 36, 49, 64, 81, ? (a) 98 (b) 102 (c) 100 (d) 101
  29. 29.46 × 1000 =
  30. 30.I thought of a number, multiplied it by 2 and added 7. I got 19. What was my number?
  31. 31.6 × 4 =
  32. 32.55 × 100 =
  33. 33.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹19. How many ₹2 coins do you have?
  34. 34.123 × 9 + 4 =
  35. 35.1 + 2 + 3 + … + 93 =
  36. 36.Magic square (every row, column and diagonal has the same total): 8 3 10 | 9 ? 5 | 4 11 6. What is the missing number?
  37. 37.9 × 3 = 2? — what is the missing digit?
  38. 38.?750 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.9 × 7 = 6? — what is the missing digit?
  40. 40.54 × 4 =

Answer key

  1. 891
  2. 8
  3. 194
  4. 777
  5. 88
  6. 1089
  7. 148
  8. 33
  9. 72
  10. 25
  11. 81
  12. 198
  13. 3
  14. 11
  15. 276
  16. 297
  17. 31
  18. 8
  19. 4
  20. 27
  21. 32
  22. 2
  23. 37
  24. 7
  25. 4
  26. 4
  27. 54
  28. 100
  29. 46000
  30. 6
  31. 24
  32. 5500
  33. 8
  34. 1111
  35. 4371
  36. 7
  37. 7
  38. 6
  39. 3
  40. 216

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