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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 278 · 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. 1.56 × 4 =
  2. 2.Double 65 =
  3. 3.What comes next? 4, 9, 16, 25, ? (a) 34 (b) 38 (c) 36 (d) 37
  4. 4.792 + 297 =
  5. 5.If today is Sunday, what day will it be after 33 days? (a) Thursday (b) Friday (c) Monday (d) Saturday
  6. 6.854 × 10 =
  7. 7.59 × 4 =
  8. 8.Magic square (every row, column and diagonal has the same total): 12 2 16 | 14 10 6 | 4 18 ?. What is the missing number?
  9. 9.39 × 4 =
  10. 10.Double 89 =
  11. 11.18 × 100 =
  12. 12.7 × 4 =
  13. 13.Do the 1089 trick with 917: reverse and subtract, then reverse that answer and add. What do you get?
  14. 14.I thought of a number, multiplied it by 3 and added 7. I got 43. What was my number?
  15. 15.Think of 12. Multiply it by 5, then add 9. What number do you end with?
  16. 16.1?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.37 × 9 =
  18. 18.9 × 10 = ?0 — what is the missing digit?
  19. 19.Double 46 =
  20. 20.9 × 2 = 1? — what is the missing digit?
  21. 21.403? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Magic square (every row, column and diagonal has the same total): 10 8 18 | 20 12 4 | 6 16 ?. What is the missing number?
  23. 23.6?93 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.23 × 4 =
  25. 25.Magic trick! Think of 5. Double it, add 16, halve it, then take away 5. What number do you get?
  26. 26.9 × 4 = ?6 — what is the missing digit?
  27. 27.15 × 1000 =
  28. 28.12 × 4 =
  29. 29.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
  30. 30.Half of 164 =
  31. 31.Magic trick! Think of 14. Double it, add 18, halve it, then take away 14. What number do you get?
  32. 32.The ages of two twins add up to 8. How old is each twin?
  33. 33.1234567 × 9 + 8 =
  34. 34.I thought of a number, multiplied it by 5 and added 1. I got 76. What was my number?
  35. 35.Magic square (every row, column and diagonal has the same total): 3 8 7 | 10 6 2 | ? 4 9. What is the missing number?
  36. 36.9 × 2 = ?8 — what is the missing digit?
  37. 37.Magic square (every row, column and diagonal has the same total): 16 11 12 | 9 13 17 | 14 15 ?. What is the missing number?
  38. 38.Half of 122 =
  39. 39.I thought of a number, multiplied it by 2 and added 8. I got 24. What was my number?
  40. 40.9 × 6 = 5? — what is the missing digit?

Answer key

  1. 224
  2. 130
  3. 36
  4. 1089
  5. Friday
  6. 8540
  7. 236
  8. 8
  9. 156
  10. 178
  11. 1800
  12. 28
  13. 1089
  14. 12
  15. 69
  16. 5
  17. 333
  18. 9
  19. 92
  20. 8
  21. 2
  22. 14
  23. 9
  24. 92
  25. 8
  26. 3
  27. 15000
  28. 48
  29. 1
  30. 82
  31. 9
  32. 4
  33. 11111111
  34. 15
  35. 5
  36. 1
  37. 10
  38. 61
  39. 8
  40. 4

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