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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 362 · 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 ages of two twins add up to 24. How old is each twin?
  2. 2.9 × 5 = 4? — what is the missing digit?
  3. 3.A piggy bank has 11 coins of ₹5 and 8 coins of ₹2. How many rupees are in it?
  4. 4.1 + 2 + 3 + … + 7 =
  5. 5.41 × 4 =
  6. 6.I thought of a number, multiplied it by 5 and added 2. I got 47. What was my number?
  7. 7.1 × 9 =
  8. 8.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 16 (c) 17 (d) 12
  9. 9.8 × 9 =
  10. 10.42 × 1000 =
  11. 11.37 × 1000 =
  12. 12.50 × 4 =
  13. 13.1 + 2 + 3 + … + 25 =
  14. 14.1 + 2 + 3 + … + 86 =
  15. 15.I thought of a number, multiplied it by 4 and added 1. I got 45. What was my number?
  16. 16.58 × 4 =
  17. 17.Double 51 =
  18. 18.9 × 3 = ?7 — what is the missing digit?
  19. 19.If today is Saturday, what day was it 55 days ago? (a) Saturday (b) Sunday (c) Monday (d) Wednesday
  20. 20.939 × 10 =
  21. 21.60 × 100 =
  22. 22.A piggy bank has 7 coins of ₹5 and 9 coins of ₹2. How many rupees are in it?
  23. 23.7 × 9 =
  24. 24.What comes next? 4, 9, 16, 25, ? (a) 38 (b) 34 (c) 36 (d) 37
  25. 25.Magic trick! Think of 11. Double it, add 16, halve it, then take away 11. What number do you get?
  26. 26.The 5th of a month is a Thursday. What day is the 16th of the same month? (a) Tuesday (b) Monday (c) Thursday (d) Sunday
  27. 27.7?21 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Magic square (every row, column and diagonal has the same total): 24 27 12 | 9 ? 33 | 30 15 18. What is the missing number?
  29. 29.9 × 10 = 9? — what is the missing digit?
  30. 30.Take 922. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  31. 31.33 × 1000 =
  32. 32.Odd one out: which number is NOT in the 5 times table? (a) 27 (b) 15 (c) 20 (d) 30
  33. 33.9 × 2 = ?8 — what is the missing digit?
  34. 34.1 + 2 + 3 + … + 35 =
  35. 35.Take 48 and take away the sum of its digits. What do you get?
  36. 36.If today is Wednesday, what day will it be after 64 days? (a) Sunday (b) Wednesday (c) Thursday (d) Friday
  37. 37.In 5 years a boy will be 19 years old. How old was he 4 years ago?
  38. 38.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 32 (c) 24 (d) 28
  39. 39.1 + 2 + 3 + … + 17 =
  40. 40.Magic square (every row, column and diagonal has the same total): 10 15 14 | ? 13 9 | 12 11 16. What is the missing number?

Answer key

  1. 12
  2. 5
  3. 71
  4. 28
  5. 164
  6. 9
  7. 9
  8. 16
  9. 72
  10. 42000
  11. 37000
  12. 200
  13. 325
  14. 3741
  15. 11
  16. 232
  17. 102
  18. 2
  19. Sunday
  20. 9390
  21. 6000
  22. 53
  23. 63
  24. 36
  25. 8
  26. Monday
  27. 8
  28. 21
  29. 0
  30. 693
  31. 33000
  32. 27
  33. 1
  34. 630
  35. 36
  36. Thursday
  37. 10
  38. 32
  39. 153
  40. 17

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