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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 942 · 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.Take 690. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  2. 2.Take 850. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  3. 3.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 50 (c) 51 (d) 49
  4. 4.Double 52 =
  5. 5.Odd one out: which number is NOT in the 8 times table? (a) 56 (b) 49 (c) 40 (d) 16
  6. 6.7 × 1000 =
  7. 7.885? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.12 × 9 + 3 =
  9. 9.If today is Monday, what day was it 42 days ago? (a) Tuesday (b) Monday (c) Sunday (d) Thursday
  10. 10.You have 8 coins. Each coin is ₹1 or ₹2, and together they make ₹14. How many ₹2 coins do you have?
  11. 11.Half of 144 =
  12. 12.4 × 9 =
  13. 13.Magic trick! Think of 18. Double it, add 18, halve it, then take away 18. What number do you get?
  14. 14.39 × ? = 39000
  15. 15.891 + 198 =
  16. 16.If today is Saturday, what day will it be after 16 days? (a) Tuesday (b) Monday (c) Sunday (d) Thursday
  17. 17.37 × 15 =
  18. 18.If today is Sunday, what day was it 29 days ago? (a) Friday (b) Tuesday (c) Saturday (d) Sunday
  19. 19.35 × 1000 =
  20. 20.What comes next? 1, 4, 9, 16, ? (a) 23 (b) 27 (c) 25 (d) 26
  21. 21.Magic square (every row, column and diagonal has the same total): 8 3 10 | 9 ? 5 | 4 11 6. What is the missing number?
  22. 22.Magic square (every row, column and diagonal has the same total): 21 23 13 | 11 ? 27 | 25 15 17. What is the missing number?
  23. 23.3 × 100 =
  24. 24.9 × 4 = 3? — what is the missing digit?
  25. 25.The 1st of a month is a Friday. What day is the 19th of the same month? (a) Wednesday (b) Monday (c) Tuesday (d) Friday
  26. 26.Double 36 =
  27. 27.1 + 2 + 3 + … + 35 =
  28. 28.1 + 3 + 5 + … + 45 =
  29. 29.9 × 4 = ?6 — what is the missing digit?
  30. 30.9 × 3 = 2? — what is the missing digit?
  31. 31.Half of 32 =
  32. 32.Double 71 =
  33. 33.Take 51 and take away the sum of its digits. What do you get?
  34. 34.40 × 4 =
  35. 35.9 × 2 =
  36. 36.Take 924. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  37. 37.The ages of two twins add up to 8. How old is each twin?
  38. 38.Take 613. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  39. 39.7 × 9 =
  40. 40.Magic square (every row, column and diagonal has the same total): 12 22 20 | 26 18 10 | 16 ? 24. What is the missing number?

Answer key

  1. 594
  2. 792
  3. 49
  4. 104
  5. 49
  6. 7000
  7. 6
  8. 111
  9. Monday
  10. 6
  11. 72
  12. 36
  13. 9
  14. 1000
  15. 1089
  16. Monday
  17. 555
  18. Saturday
  19. 35000
  20. 25
  21. 7
  22. 19
  23. 300
  24. 6
  25. Tuesday
  26. 72
  27. 630
  28. 529
  29. 3
  30. 7
  31. 16
  32. 142
  33. 45
  34. 160
  35. 18
  36. 495
  37. 4
  38. 297
  39. 63
  40. 14

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