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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 482 · 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.I thought of a number, added 5 and then doubled it. I got 34. What was my number?
  2. 2.Double 11 =
  3. 3.Magic square (every row, column and diagonal has the same total): 15 10 11 | 8 12 16 | 13 ? 9. What is the missing number?
  4. 4.35 × 4 =
  5. 5.19 × ? = 19000
  6. 6.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹12. How many ₹2 coins do you have?
  7. 7.Take 36 and take away the sum of its digits. What do you get?
  8. 8.The ages of two twins add up to 22. How old is each twin?
  9. 9.9 × 4 =
  10. 10.I thought of a number, added 6 and then doubled it. I got 20. What was my number?
  11. 11.10 × 100 =
  12. 12.1234 × 9 + 5 =
  13. 13.A girl is 6 years old and her brother is 4 years older. How old will her brother be in 7 years?
  14. 14.9 × 3 = ?7 — what is the missing digit?
  15. 15.8 × 4 =
  16. 16.12345679 × 81 =
  17. 17.9 × 4 = 3? — what is the missing digit?
  18. 18.32 × 100 =
  19. 19.16 × 4 =
  20. 20.A piggy bank has 2 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?
  21. 21.Do the 1089 trick with 911: reverse and subtract, then reverse that answer and add. What do you get?
  22. 22.4?28 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.If today is Monday, what day was it 58 days ago? (a) Friday (b) Saturday (c) Tuesday (d) Sunday
  24. 24.Half of 86 =
  25. 25.9 × 9 =
  26. 26.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹6. How many ₹2 coins do you have?
  27. 27.39 × 4 =
  28. 28.Half of 72 =
  29. 29.19 × 4 =
  30. 30.1 + 3 + 5 + … + 37 =
  31. 31.11111 × 11111 =
  32. 32.Double 89 =
  33. 33.Magic square (every row, column and diagonal has the same total): 10 3 8 | ? 7 9 | 6 11 4. What is the missing number?
  34. 34.Half of 188 =
  35. 35.What comes next? 4, 8, 16, 32, ? (a) 65 (b) 64 (c) 56 (d) 48
  36. 36.5 × 9 =
  37. 37.Magic square (every row, column and diagonal has the same total): 13 ? 17 | 15 11 7 | 5 19 9. What is the missing number?
  38. 38.58 × 4 =
  39. 39.29 × 10 =
  40. 40.42 × 4 =

Answer key

  1. 12
  2. 22
  3. 14
  4. 140
  5. 1000
  6. 3
  7. 27
  8. 11
  9. 36
  10. 4
  11. 1000
  12. 11111
  13. 17
  14. 2
  15. 32
  16. 999999999
  17. 6
  18. 3200
  19. 64
  20. 16
  21. 1089
  22. 4
  23. Saturday
  24. 43
  25. 81
  26. 1
  27. 156
  28. 36
  29. 76
  30. 361
  31. 123454321
  32. 178
  33. 5
  34. 94
  35. 64
  36. 45
  37. 3
  38. 232
  39. 290
  40. 168

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