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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 721 · 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 × 15 =
  2. 2.In 4 years a boy will be 12 years old. How old was he 3 years ago?
  3. 3.9 × 1 =
  4. 4.8 × 4 =
  5. 5.836? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.If today is Wednesday, what day was it 36 days ago? (a) Wednesday (b) Tuesday (c) Monday (d) Friday
  7. 7.Magic square (every row, column and diagonal has the same total): 6 ? 14 | 20 12 4 | 10 8 18. What is the missing number?
  8. 8.Magic square (every row, column and diagonal has the same total): 10 ? 14 | 15 11 7 | 8 13 12. What is the missing number?
  9. 9.2 × 9 =
  10. 10.123 × 8 + 3 =
  11. 11.9 × 9 = 8? — what is the missing digit?
  12. 12.Take 200. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  13. 13.Think of 2. Multiply it by 3, then add 8. What number do you end with?
  14. 14.1 + 3 + 5 + … + 23 =
  15. 15.Magic square (every row, column and diagonal has the same total): 12 7 14 | 13 11 9 | 8 15 ?. What is the missing number?
  16. 16.A piggy bank has 2 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
  17. 17.A girl is 10 years old and her brother is 5 years older. How old will her brother be in 6 years?
  18. 18.312 × 10 =
  19. 19.Magic square (every row, column and diagonal has the same total): 15 25 11 | 13 ? 21 | 23 9 19. What is the missing number?
  20. 20.I thought of a number, added 2 and then doubled it. I got 34. What was my number?
  21. 21.30 × 4 =
  22. 22.What comes next? 4, 8, 16, 32, ? (a) 64 (b) 48 (c) 56 (d) 65
  23. 23.A girl is 6 years old and her brother is 2 years older. How old will her brother be in 2 years?
  24. 24.Double 68 =
  25. 25.98 × 100 =
  26. 26.If today is Friday, what day will it be after 43 days? (a) Sunday (b) Tuesday (c) Saturday (d) Friday
  27. 27.1 + 3 + 5 + … + 39 =
  28. 28.If today is Sunday, what day will it be after 20 days? (a) Friday (b) Tuesday (c) Sunday (d) Saturday
  29. 29.The ages of two twins add up to 30. How old is each twin?
  30. 30.Odd one out: which number is NOT in the 4 times table? (a) 20 (b) 8 (c) 26 (d) 16
  31. 31.9 × 3 = ?7 — what is the missing digit?
  32. 32.13 × 4 =
  33. 33.The 2nd of a month is a Friday. What day is the 10th of the same month? (a) Tuesday (b) Friday (c) Sunday (d) Saturday
  34. 34.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
  35. 35.12345679 × 63 =
  36. 36.Magic square (every row, column and diagonal has the same total): 26 11 14 | 5 17 ? | 20 23 8. What is the missing number?
  37. 37.What comes next? 36, 49, 64, 81, ? (a) 98 (b) 100 (c) 101 (d) 102
  38. 38.2 × 1000 =
  39. 39.693 + 396 =
  40. 40.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?

Answer key

  1. 555
  2. 5
  3. 9
  4. 32
  5. 1
  6. Tuesday
  7. 16
  8. 9
  9. 18
  10. 987
  11. 1
  12. 198
  13. 14
  14. 144
  15. 10
  16. 36
  17. 21
  18. 3120
  19. 17
  20. 15
  21. 120
  22. 64
  23. 10
  24. 136
  25. 9800
  26. Saturday
  27. 400
  28. Saturday
  29. 15
  30. 26
  31. 2
  32. 52
  33. Saturday
  34. 5
  35. 777777777
  36. 29
  37. 100
  38. 2000
  39. 1089
  40. 297

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