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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 201 · 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. 1.909 × ? = 9090
  2. 2.198 + 891 =
  3. 3.Do the 1089 trick with 118: reverse and subtract, then reverse that answer and add. What do you get?
  4. 4.Take 846. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  5. 5.9 × 5 = ?5 — what is the missing digit?
  6. 6.Odd one out: which number is NOT in the 7 times table? (a) 63 (b) 28 (c) 42 (d) 15
  7. 7.Double 56 =
  8. 8.1 + 2 + 3 + … + 41 =
  9. 9.9 × 4 =
  10. 10.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 80 (c) 60 (d) 70
  11. 11.In 3 years a boy will be 14 years old. How old was he 7 years ago?
  12. 12.7 × 9 =
  13. 13.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  14. 14.Magic square (every row, column and diagonal has the same total): 7 6 11 | ? 8 4 | 5 10 9. What is the missing number?
  15. 15.20 × 4 =
  16. 16.12345 × 8 + 5 =
  17. 17.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 32 (c) 24 (d) 28
  18. 18.If today is Sunday, what day was it 17 days ago? (a) Thursday (b) Friday (c) Sunday (d) Wednesday
  19. 19.A piggy bank has 7 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
  20. 20.Do the 1089 trick with 260: reverse and subtract, then reverse that answer and add. What do you get?
  21. 21.35 × ? = 35000
  22. 22.9 × 6 = ?4 — what is the missing digit?
  23. 23.The ages of two twins add up to 8. How old is each twin?
  24. 24.9 × 5 =
  25. 25.If today is Friday, what day will it be after 21 days? (a) Thursday (b) Friday (c) Monday (d) Saturday
  26. 26.Double 19 =
  27. 27.1 + 2 + 3 + … + 31 =
  28. 28.Do the 1089 trick with 760: reverse and subtract, then reverse that answer and add. What do you get?
  29. 29.919 × 10 =
  30. 30.Magic square (every row, column and diagonal has the same total): 28 ? 16 | 7 19 31 | 22 25 10. What is the missing number?
  31. 31.10 × 9 =
  32. 32.Half of 52 =
  33. 33.80?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.A piggy bank has 3 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
  35. 35.9 × 4 = 3? — what is the missing digit?
  36. 36.177 × 10 =
  37. 37.A girl is 6 years old and her brother is 3 years older. How old will her brother be in 7 years?
  38. 38.The 4th of a month is a Sunday. What day is the 28th of the same month? (a) Tuesday (b) Saturday (c) Thursday (d) Wednesday
  39. 39.694 × 10 =
  40. 40.396 + 693 =

Answer key

  1. 10
  2. 1089
  3. 1089
  4. 198
  5. 4
  6. 15
  7. 112
  8. 861
  9. 36
  10. 80
  11. 4
  12. 63
  13. 792
  14. 12
  15. 80
  16. 98765
  17. 32
  18. Thursday
  19. 63
  20. 1089
  21. 1000
  22. 5
  23. 4
  24. 45
  25. Friday
  26. 38
  27. 496
  28. 1089
  29. 9190
  30. 13
  31. 90
  32. 26
  33. 6
  34. 43
  35. 6
  36. 1770
  37. 16
  38. Wednesday
  39. 6940
  40. 1089

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