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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 142 · 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.Think of 2. Multiply it by 5, then add 7. What number do you end with?
  2. 2.9 × 3 = 2? — what is the missing digit?
  3. 3.Magic trick! Think of 3. Double it, add 8, halve it, then take away 3. What number do you get?
  4. 4.The 4th of a month is a Tuesday. What day is the 16th of the same month? (a) Monday (b) Wednesday (c) Sunday (d) Saturday
  5. 5.9 × 2 =
  6. 6.1 + 3 + 5 + … + 41 =
  7. 7.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹22. How many ₹2 coins do you have?
  8. 8.Magic square (every row, column and diagonal has the same total): 22 7 28 | 25 19 13 | 10 ? 16. What is the missing number?
  9. 9.Magic trick! Think of 11. Double it, add 6, halve it, then take away 11. What number do you get?
  10. 10.Think of 7. Multiply it by 5, then add 9. What number do you end with?
  11. 11.1 + 3 + 5 + … + 39 =
  12. 12.The 8th of a month is a Friday. What day is the 19th of the same month? (a) Wednesday (b) Monday (c) Friday (d) Tuesday
  13. 13.A piggy bank has 2 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
  14. 14.?251 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.53 × 4 =
  16. 16.Take 45 and take away the sum of its digits. What do you get?
  17. 17.46 × 4 =
  18. 18.9 × 2 = ?8 — what is the missing digit?
  19. 19.9 × 9 = 8? — what is the missing digit?
  20. 20.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 42 (c) 48 (d) 49
  21. 21.4 × 9 =
  22. 22.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 16 (c) 17 (d) 12
  23. 23.49 × 4 =
  24. 24.12 × 10 =
  25. 25.Double 71 =
  26. 26.17 × 4 =
  27. 27.The ages of two twins add up to 22. How old is each twin?
  28. 28.9 × 5 =
  29. 29.10 × 9 =
  30. 30.962 × 10 =
  31. 31.What comes next? 12, 20, 28, 36, ? (a) 45 (b) 44 (c) 36 (d) 52
  32. 32.9 × 7 = ?3 — what is the missing digit?
  33. 33.5 × 9 =
  34. 34.404 × 10 =
  35. 35.9 × 10 = ?0 — what is the missing digit?
  36. 36.11111 × 11111 =
  37. 37.55 × 4 =
  38. 38.6 × 4 =
  39. 39.If today is Sunday, what day was it 48 days ago? (a) Tuesday (b) Monday (c) Sunday (d) Thursday
  40. 40.37 × 6 =

Answer key

  1. 17
  2. 7
  3. 4
  4. Sunday
  5. 18
  6. 441
  7. 7
  8. 31
  9. 3
  10. 44
  11. 400
  12. Tuesday
  13. 38
  14. 1
  15. 212
  16. 36
  17. 184
  18. 1
  19. 1
  20. 48
  21. 36
  22. 16
  23. 196
  24. 120
  25. 142
  26. 68
  27. 11
  28. 45
  29. 90
  30. 9620
  31. 44
  32. 6
  33. 45
  34. 4040
  35. 9
  36. 123454321
  37. 220
  38. 24
  39. Monday
  40. 222

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