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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 180 · 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. 1.365? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Double 55 =
  3. 3.41 × 4 =
  4. 4.620 × 10 =
  5. 5.I thought of a number, multiplied it by 3 and added 9. I got 21. What was my number?
  6. 6.?493 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  8. 8.I thought of a number, multiplied it by 2 and added 5. I got 19. What was my number?
  9. 9.Take 88 and take away the sum of its digits. What do you get?
  10. 10.?219 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.1 + 3 + 5 + … + 37 =
  12. 12.9 × 2 = 1? — what is the missing digit?
  13. 13.I thought of a number, added 3 and then doubled it. I got 20. What was my number?
  14. 14.718 × ? = 7180
  15. 15.34 × 100 =
  16. 16.10 × 1000 =
  17. 17.3 × 9 =
  18. 18.Half of 162 =
  19. 19.Odd one out: which number is NOT in the 8 times table? (a) 56 (b) 31 (c) 16 (d) 32
  20. 20.25 × 4 =
  21. 21.50 × 4 =
  22. 22.Magic trick! Think of 16. Double it, add 8, halve it, then take away 16. What number do you get?
  23. 23.1 + 2 + 3 + … + 6 =
  24. 24.A piggy bank has 7 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
  25. 25.Magic trick! Think of 10. Double it, add 6, halve it, then take away 10. What number do you get?
  26. 26.Magic square (every row, column and diagonal has the same total): 5 10 3 | 4 6 8 | ? 2 7. What is the missing number?
  27. 27.The ages of two twins add up to 8. How old is each twin?
  28. 28.What comes next? 8, 13, 18, 23, ? (a) 29 (b) 33 (c) 28 (d) 23
  29. 29.7?72 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.54 × 100 =
  31. 31.I thought of a number, added 6 and then doubled it. I got 26. What was my number?
  32. 32.Think of 11. Multiply it by 2, then add 1. What number do you end with?
  33. 33.70 × ? = 7000
  34. 34.6 × 9 =
  35. 35.9 × 9 = ?1 — what is the missing digit?
  36. 36.Half of 82 =
  37. 37.Half of 152 =
  38. 38.12 × 9 + 3 =
  39. 39.4?69 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Think of 12. Multiply it by 2, then add 1. What number do you end with?

Answer key

  1. 4
  2. 110
  3. 164
  4. 6200
  5. 4
  6. 2
  7. 792
  8. 7
  9. 72
  10. 6
  11. 361
  12. 8
  13. 7
  14. 10
  15. 3400
  16. 10000
  17. 27
  18. 81
  19. 31
  20. 100
  21. 200
  22. 4
  23. 21
  24. 45
  25. 3
  26. 9
  27. 4
  28. 28
  29. 2
  30. 5400
  31. 7
  32. 23
  33. 100
  34. 54
  35. 8
  36. 41
  37. 76
  38. 111
  39. 8
  40. 25

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