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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 608 · 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. 1.1 + 3 + 5 + … + 19 =
  2. 2.Magic square (every row, column and diagonal has the same total): 20 10 12 | 6 14 22 | 16 18 ?. What is the missing number?
  3. 3.A girl is 7 years old and her brother is 3 years older. How old will her brother be in 5 years?
  4. 4.The ages of two twins add up to 20. How old is each twin?
  5. 5.If today is Wednesday, what day will it be after 45 days? (a) Sunday (b) Friday (c) Tuesday (d) Saturday
  6. 6.1 + 2 + 3 + … + 36 =
  7. 7.Magic square (every row, column and diagonal has the same total): 17 ? 13 | 7 11 15 | 9 19 5. What is the missing number?
  8. 8.Think of 11. Multiply it by 4, then add 1. What number do you end with?
  9. 9.If today is Tuesday, what day was it 59 days ago? (a) Tuesday (b) Friday (c) Saturday (d) Sunday
  10. 10.Magic square (every row, column and diagonal has the same total): 9 2 7 | ? 6 8 | 5 10 3. What is the missing number?
  11. 11.627? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.I thought of a number, added 3 and then doubled it. I got 18. What was my number?
  13. 13.Double 56 =
  14. 14.Double 25 =
  15. 15.Take 48 and take away the sum of its digits. What do you get?
  16. 16.If today is Thursday, what day was it 20 days ago? (a) Saturday (b) Thursday (c) Monday (d) Friday
  17. 17.9 × 2 =
  18. 18.?200 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 138. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  20. 20.9 × 2 = ?8 — what is the missing digit?
  21. 21.91? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.A piggy bank has 12 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
  23. 23.I thought of a number, multiplied it by 3 and added 3. I got 30. What was my number?
  24. 24.12345679 × 63 =
  25. 25.In 3 years a boy will be 12 years old. How old was he 2 years ago?
  26. 26.Double 42 =
  27. 27.891 + 198 =
  28. 28.297 + 792 =
  29. 29.Magic square (every row, column and diagonal has the same total): 16 6 20 | 18 ? 10 | 8 22 12. What is the missing number?
  30. 30.1 + 2 + 3 + … + 6 =
  31. 31.25 × 4 =
  32. 32.12 × 1000 =
  33. 33.9 × 6 =
  34. 34.I thought of a number, multiplied it by 3 and added 5. I got 20. What was my number?
  35. 35.In 3 years a boy will be 12 years old. How old was he 6 years ago?
  36. 36.Half of 34 =
  37. 37.Half of 14 =
  38. 38.Magic trick! Think of 6. Double it, add 4, halve it, then take away 6. What number do you get?
  39. 39.9 × 5 =
  40. 40.9 × 9 = ?1 — what is the missing digit?

Answer key

  1. 100
  2. 8
  3. 15
  4. 10
  5. Saturday
  6. 666
  7. 3
  8. 45
  9. Saturday
  10. 4
  11. 3
  12. 6
  13. 112
  14. 50
  15. 36
  16. Friday
  17. 18
  18. 7
  19. 693
  20. 1
  21. 8
  22. 74
  23. 9
  24. 777777777
  25. 7
  26. 84
  27. 1089
  28. 1089
  29. 14
  30. 21
  31. 100
  32. 12000
  33. 54
  34. 5
  35. 3
  36. 17
  37. 7
  38. 2
  39. 45
  40. 8

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