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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 660 · 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.The 1st of a month is a Monday. What day is the 30th of the same month? (a) Monday (b) Friday (c) Wednesday (d) Tuesday
  2. 2.1 + 3 + 5 + … + 13 =
  3. 3.Double 15 =
  4. 4.13 × 4 =
  5. 5.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 51 (c) 49 (d) 50
  6. 6.I thought of a number, added 4 and then doubled it. I got 26. What was my number?
  7. 7.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹24. How many ₹2 coins do you have?
  8. 8.You have 10 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
  9. 9.1234 × 9 + 5 =
  10. 10.Think of 14. Multiply it by 2, then add 3. What number do you end with?
  11. 11.9 × 7 = ?3 — what is the missing digit?
  12. 12.Half of 26 =
  13. 13.28 × 4 =
  14. 14.9 × 2 = ?8 — what is the missing digit?
  15. 15.If today is Friday, what day will it be after 99 days? (a) Friday (b) Sunday (c) Tuesday (d) Saturday
  16. 16.24 × ? = 2400
  17. 17.Take 873. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  18. 18.4 × 9 =
  19. 19.Think of 4. Multiply it by 5, then add 5. What number do you end with?
  20. 20.Odd one out: which number is NOT in the 9 times table? (a) 41 (b) 45 (c) 63 (d) 36
  21. 21.Half of 64 =
  22. 22.1 + 2 + 3 + … + 72 =
  23. 23.Take 720. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  24. 24.34 × 4 =
  25. 25.Magic square (every row, column and diagonal has the same total): 9 4 11 | 10 8 ? | 5 12 7. What is the missing number?
  26. 26.9 × 1 =
  27. 27.Double 82 =
  28. 28.17 × 4 =
  29. 29.9 × 3 = 2? — what is the missing digit?
  30. 30.1 + 2 + 3 + … + 75 =
  31. 31.Half of 168 =
  32. 32.Think of 9. Multiply it by 3, then add 1. What number do you end with?
  33. 33.88 × ? = 880
  34. 34.2 × 9 =
  35. 35.9 × 8 = ?2 — what is the missing digit?
  36. 36.Magic trick! Think of 3. Double it, add 10, halve it, then take away 3. What number do you get?
  37. 37.56 × 4 =
  38. 38.123 × 9 + 4 =
  39. 39.Take 990. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  40. 40.99? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. Tuesday
  2. 49
  3. 30
  4. 52
  5. 49
  6. 9
  7. 11
  8. 1
  9. 11111
  10. 31
  11. 6
  12. 13
  13. 112
  14. 1
  15. Saturday
  16. 100
  17. 495
  18. 36
  19. 25
  20. 41
  21. 32
  22. 2628
  23. 693
  24. 136
  25. 6
  26. 9
  27. 164
  28. 68
  29. 7
  30. 2850
  31. 84
  32. 28
  33. 10
  34. 18
  35. 7
  36. 5
  37. 224
  38. 1111
  39. 891
  40. 9

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