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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 14 · 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. 1.37 × 27 =
  2. 2.1 + 2 + 3 + … + 15 =
  3. 3.The ages of two twins add up to 8. How old is each twin?
  4. 4.495 + 594 =
  5. 5.9 × 7 = 6? — what is the missing digit?
  6. 6.111111 × 111111 =
  7. 7.9 × 2 = 1? — what is the missing digit?
  8. 8.285 × ? = 2850
  9. 9.1 + 2 + 3 + … + 21 =
  10. 10.A piggy bank has 12 coins of ₹5 and 10 coins of ₹2. How many rupees are in it?
  11. 11.Take 17 and take away the sum of its digits. What do you get?
  12. 12.6 × 9 =
  13. 13.53?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.3 × 9 =
  15. 15.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 62 (c) 66 (d) 64
  16. 16.12345679 × 81 =
  17. 17.Think of 7. Multiply it by 5, then add 7. What number do you end with?
  18. 18.If today is Tuesday, what day will it be after 26 days? (a) Saturday (b) Monday (c) Wednesday (d) Sunday
  19. 19.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 80 (c) 81 (d) 70
  20. 20.9 × 3 = ?7 — what is the missing digit?
  21. 21.Do the 1089 trick with 940: reverse and subtract, then reverse that answer and add. What do you get?
  22. 22.1 + 2 + 3 + … + 42 =
  23. 23.Take 29 and take away the sum of its digits. What do you get?
  24. 24.44 × 4 =
  25. 25.Think of 4. Multiply it by 5, then add 6. What number do you end with?
  26. 26.37? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.If today is Friday, what day will it be after 14 days? (a) Monday (b) Friday (c) Saturday (d) Thursday
  28. 28.12345679 × 45 =
  29. 29.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  30. 30.9 × 5 = ?5 — what is the missing digit?
  31. 31.A father is 34 years old and his son is 6. How old was the father when the son was born?
  32. 32.?112 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 99 and take away the sum of its digits. What do you get?
  34. 34.50 × 4 =
  35. 35.88 × 100 =
  36. 36.Magic square (every row, column and diagonal has the same total): ? 5 15 | 9 13 17 | 11 21 7. What is the missing number?
  37. 37.The 6th of a month is a Thursday. What day is the 15th of the same month? (a) Tuesday (b) Friday (c) Sunday (d) Saturday
  38. 38.36 × 4 =
  39. 39.Magic square (every row, column and diagonal has the same total): 9 2 7 | 4 6 8 | ? 10 3. What is the missing number?
  40. 40.9 × 6 = ?4 — what is the missing digit?

Answer key

  1. 999
  2. 120
  3. 4
  4. 1089
  5. 3
  6. 12345654321
  7. 8
  8. 10
  9. 231
  10. 80
  11. 9
  12. 54
  13. 1
  14. 27
  15. 64
  16. 999999999
  17. 42
  18. Sunday
  19. 80
  20. 2
  21. 1089
  22. 903
  23. 18
  24. 176
  25. 26
  26. 8
  27. Friday
  28. 555555555
  29. 594
  30. 4
  31. 28
  32. 5
  33. 81
  34. 200
  35. 8800
  36. 19
  37. Saturday
  38. 144
  39. 5
  40. 5

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