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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 553 · 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. 1.44 × 4 =
  2. 2.495 + 594 =
  3. 3.35 × 4 =
  4. 4.Magic trick! Think of 7. Double it, add 6, halve it, then take away 7. What number do you get?
  5. 5.9 × 100 =
  6. 6.Double 71 =
  7. 7.The 6th of a month is a Sunday. What day is the 16th of the same month? (a) Thursday (b) Saturday (c) Wednesday (d) Tuesday
  8. 8.A piggy bank has 6 coins of ₹5 and 10 coins of ₹2. How many rupees are in it?
  9. 9.9 × 6 =
  10. 10.If today is Thursday, what day was it 46 days ago? (a) Wednesday (b) Sunday (c) Saturday (d) Monday
  11. 11.15 × 4 =
  12. 12.15 × 100 =
  13. 13.1234567 × 8 + 7 =
  14. 14.Take 28 and take away the sum of its digits. What do you get?
  15. 15.1 + 2 + 3 + … + 26 =
  16. 16.1 × 9 =
  17. 17.495 × ? = 4950
  18. 18.1 + 2 + 3 + … + 77 =
  19. 19.556 × 10 =
  20. 20.5 × 9 =
  21. 21.9 × 4 = 3? — what is the missing digit?
  22. 22.9 × 10 = 9? — what is the missing digit?
  23. 23.In 5 years a boy will be 18 years old. How old was he 5 years ago?
  24. 24.7 × 9 =
  25. 25.9 × 8 =
  26. 26.Magic square (every row, column and diagonal has the same total): 6 11 10 | 13 9 5 | 8 ? 12. What is the missing number?
  27. 27.460 × ? = 4600
  28. 28.What comes next? 4, 9, 16, 25, ? (a) 38 (b) 34 (c) 37 (d) 36
  29. 29.6 × 9 =
  30. 30.1 + 2 + 3 + … + 41 =
  31. 31.Magic square (every row, column and diagonal has the same total): 7 ? 5 | 6 8 10 | 11 4 9. What is the missing number?
  32. 32.Take 37 and take away the sum of its digits. What do you get?
  33. 33.2 × 9 =
  34. 34.41 × 4 =
  35. 35.The 2nd of a month is a Saturday. What day is the 24th of the same month? (a) Sunday (b) Monday (c) Saturday (d) Wednesday
  36. 36.1 + 2 + 3 + … + 79 =
  37. 37.A piggy bank has 2 coins of ₹5 and 6 coins of ₹2. How many rupees are in it?
  38. 38.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  39. 39.Odd one out: which number is NOT in the 5 times table? (a) 35 (b) 20 (c) 50 (d) 42
  40. 40.If today is Monday, what day was it 19 days ago? (a) Tuesday (b) Saturday (c) Thursday (d) Wednesday

Answer key

  1. 176
  2. 1089
  3. 140
  4. 3
  5. 900
  6. 142
  7. Wednesday
  8. 50
  9. 54
  10. Sunday
  11. 60
  12. 1500
  13. 9876543
  14. 18
  15. 351
  16. 9
  17. 10
  18. 3003
  19. 5560
  20. 45
  21. 6
  22. 0
  23. 8
  24. 63
  25. 72
  26. 7
  27. 10
  28. 36
  29. 54
  30. 861
  31. 12
  32. 27
  33. 18
  34. 164
  35. Sunday
  36. 3160
  37. 22
  38. 693
  39. 42
  40. Wednesday

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