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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 728 · 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. 1.52 × 100 =
  2. 2.1 + 3 + 5 + … + 23 =
  3. 3.Think of 3. Multiply it by 5, then add 8. What number do you end with?
  4. 4.What comes next? 7, 9, 11, 13, ? (a) 16 (b) 15 (c) 17 (d) 13
  5. 5.675 × ? = 6750
  6. 6.Take 40 and take away the sum of its digits. What do you get?
  7. 7.Double 11 =
  8. 8.In 3 years a boy will be 15 years old. How old was he 4 years ago?
  9. 9.I thought of a number, multiplied it by 2 and added 7. I got 15. What was my number?
  10. 10.9 × 3 = 2? — what is the missing digit?
  11. 11.9 × 3 = ?7 — what is the missing digit?
  12. 12.If today is Monday, what day will it be after 59 days? (a) Sunday (b) Thursday (c) Wednesday (d) Friday
  13. 13.Do the 1089 trick with 900: reverse and subtract, then reverse that answer and add. What do you get?
  14. 14.Magic square (every row, column and diagonal has the same total): 17 ? 25 | 27 19 11 | 13 23 21. What is the missing number?
  15. 15.9 × 10 = ?0 — what is the missing digit?
  16. 16.147? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.10 × 4 =
  18. 18.3 × 9 =
  19. 19.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹8. How many ₹2 coins do you have?
  20. 20.Magic square (every row, column and diagonal has the same total): 6 11 ? | 5 7 9 | 10 3 8. What is the missing number?
  21. 21.8 × 9 =
  22. 22.Take 89 and take away the sum of its digits. What do you get?
  23. 23.9 × 4 = 3? — what is the missing digit?
  24. 24.9 × 8 = 7? — what is the missing digit?
  25. 25.7?53 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Think of 8. Multiply it by 3, then add 5. What number do you end with?
  27. 27.What comes next? 16, 25, 36, 49, ? (a) 66 (b) 64 (c) 65 (d) 62
  28. 28.The ages of two twins add up to 10. How old is each twin?
  29. 29.1 + 2 + 3 + … + 68 =
  30. 30.400 × 10 =
  31. 31.Take 91 and take away the sum of its digits. What do you get?
  32. 32.12345 × 9 + 6 =
  33. 33.9 × 9 = ?1 — what is the missing digit?
  34. 34.40? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.12345679 × 9 =
  36. 36.Think of 7. Multiply it by 2, then add 2. What number do you end with?
  37. 37.311 × ? = 3110
  38. 38.55 × 100 =
  39. 39.What comes next? 10, 13, 16, 19, ? (a) 19 (b) 22 (c) 23 (d) 25
  40. 40.A piggy bank has 3 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?

Answer key

  1. 5200
  2. 144
  3. 23
  4. 15
  5. 10
  6. 36
  7. 22
  8. 8
  9. 4
  10. 7
  11. 2
  12. Thursday
  13. 1089
  14. 15
  15. 9
  16. 6
  17. 40
  18. 27
  19. 2
  20. 4
  21. 72
  22. 72
  23. 6
  24. 2
  25. 3
  26. 29
  27. 64
  28. 5
  29. 2346
  30. 4000
  31. 81
  32. 111111
  33. 8
  34. 5
  35. 111111111
  36. 16
  37. 10
  38. 5500
  39. 22
  40. 29

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