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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 2 · 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.Think of 2. Multiply it by 2, then add 3. What number do you end with?
  2. 2.The 7th of a month is a Friday. What day is the 15th of the same month? (a) Tuesday (b) Saturday (c) Friday (d) Sunday
  3. 3.I thought of a number, added 5 and then doubled it. I got 34. What was my number?
  4. 4.?103 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Magic square (every row, column and diagonal has the same total): 22 7 28 | 25 19 13 | 10 ? 16. What is the missing number?
  6. 6.Magic trick! Think of 20. Double it, add 4, halve it, then take away 20. What number do you get?
  7. 7.Half of 72 =
  8. 8.4 × 9 =
  9. 9.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 66 (c) 62 (d) 64
  10. 10.1 + 2 + 3 + … + 36 =
  11. 11.1 + 3 + 5 + … + 9 =
  12. 12.9 × 1 =
  13. 13.1 + 3 + 5 + … + 15 =
  14. 14.1111 × 1111 =
  15. 15.You have 10 coins. Each coin is ₹1 or ₹2, and together they make ₹15. How many ₹2 coins do you have?
  16. 16.The ages of two twins add up to 12. How old is each twin?
  17. 17.9 × 2 = ?8 — what is the missing digit?
  18. 18.Take 750. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  19. 19.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹18. How many ₹2 coins do you have?
  20. 20.37 × 27 =
  21. 21.1234 × 9 + 5 =
  22. 22.30 × ? = 30000
  23. 23.I thought of a number, added 9 and then doubled it. I got 44. What was my number?
  24. 24.9 × 7 = 6? — what is the missing digit?
  25. 25.?373 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Magic trick! Think of 6. Double it, add 6, halve it, then take away 6. What number do you get?
  27. 27.Magic square (every row, column and diagonal has the same total): 26 5 20 | 11 17 23 | 14 ? 8. What is the missing number?
  28. 28.A piggy bank has 5 coins of ₹5 and 9 coins of ₹2. How many rupees are in it?
  29. 29.Magic square (every row, column and diagonal has the same total): ? 20 6 | 8 12 16 | 18 4 14. What is the missing number?
  30. 30.10 × 4 =
  31. 31.The ages of two twins add up to 16. How old is each twin?
  32. 32.60 × 4 =
  33. 33.Magic square (every row, column and diagonal has the same total): ? 26 12 | 14 18 22 | 24 10 20. What is the missing number?
  34. 34.1 + 2 + 3 + … + 96 =
  35. 35.17 × 4 =
  36. 36.Think of 2. Multiply it by 4, then add 7. What number do you end with?
  37. 37.9 × 5 = 4? — what is the missing digit?
  38. 38.If today is Thursday, what day was it 30 days ago? (a) Wednesday (b) Monday (c) Friday (d) Tuesday
  39. 39.9 × 9 = ?1 — what is the missing digit?
  40. 40.111111 × 111111 =

Answer key

  1. 7
  2. Saturday
  3. 12
  4. 5
  5. 31
  6. 2
  7. 36
  8. 36
  9. 64
  10. 666
  11. 25
  12. 9
  13. 64
  14. 1234321
  15. 5
  16. 6
  17. 1
  18. 693
  19. 7
  20. 999
  21. 11111
  22. 1000
  23. 13
  24. 3
  25. 5
  26. 3
  27. 29
  28. 43
  29. 10
  30. 40
  31. 8
  32. 240
  33. 16
  34. 4656
  35. 68
  36. 15
  37. 5
  38. Tuesday
  39. 8
  40. 12345654321

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