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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 973 · 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. 1.2 × 9 =
  2. 2.9 × 6 = 5? — what is the missing digit?
  3. 3.Double 12 =
  4. 4.9 × 10 = ?0 — what is the missing digit?
  5. 5.1234567 × 9 + 8 =
  6. 6.9 × 8 = ?2 — what is the missing digit?
  7. 7.1111 × 1111 =
  8. 8.9 × 2 = ?8 — what is the missing digit?
  9. 9.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  10. 10.693 + 396 =
  11. 11.37 × 9 =
  12. 12.9 × 2 = 1? — what is the missing digit?
  13. 13.793 × 10 =
  14. 14.A father is 35 years old and his son is 6. How old was the father when the son was born?
  15. 15.Think of 4. Multiply it by 4, then add 9. What number do you end with?
  16. 16.Half of 124 =
  17. 17.37 × 3 =
  18. 18.9 × 3 = ?7 — what is the missing digit?
  19. 19.Magic square (every row, column and diagonal has the same total): 13 18 11 | 12 14 16 | 17 10 ?. What is the missing number?
  20. 20.9 × 6 =
  21. 21.17 × 4 =
  22. 22.If today is Friday, what day was it 53 days ago? (a) Monday (b) Tuesday (c) Sunday (d) Thursday
  23. 23.Do the 1089 trick with 896: reverse and subtract, then reverse that answer and add. What do you get?
  24. 24.The ages of two twins add up to 14. How old is each twin?
  25. 25.Double 96 =
  26. 26.243? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 874. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  28. 28.The 2nd of a month is a Friday. What day is the 10th of the same month? (a) Tuesday (b) Saturday (c) Friday (d) Sunday
  29. 29.A piggy bank has 9 coins of ₹5 and 12 coins of ₹2. How many rupees are in it?
  30. 30.37 × 24 =
  31. 31.9 × 7 =
  32. 32.If today is Friday, what day will it be after 76 days? (a) Thursday (b) Friday (c) Sunday (d) Wednesday
  33. 33.84 × 100 =
  34. 34.If today is Monday, what day will it be after 62 days? (a) Saturday (b) Monday (c) Wednesday (d) Sunday
  35. 35.8 × 100 =
  36. 36.59 × 4 =
  37. 37.7 × 100 =
  38. 38.What comes next? 2, 4, 8, 16, ? (a) 28 (b) 24 (c) 33 (d) 32
  39. 39.37 × ? = 37000
  40. 40.Double 24 =

Answer key

  1. 18
  2. 4
  3. 24
  4. 9
  5. 11111111
  6. 7
  7. 1234321
  8. 1
  9. 792
  10. 1089
  11. 333
  12. 8
  13. 7930
  14. 29
  15. 25
  16. 62
  17. 111
  18. 2
  19. 15
  20. 54
  21. 68
  22. Monday
  23. 1089
  24. 7
  25. 192
  26. 9
  27. 396
  28. Saturday
  29. 69
  30. 888
  31. 63
  32. Thursday
  33. 8400
  34. Sunday
  35. 800
  36. 236
  37. 700
  38. 32
  39. 1000
  40. 48

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