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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 374 · 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.A piggy bank has 7 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
  2. 2.Take 769. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  3. 3.Magic square (every row, column and diagonal has the same total): 15 17 7 | 5 13 21 | 19 9 ?. What is the missing number?
  4. 4.I thought of a number, added 1 and then doubled it. I got 12. What was my number?
  5. 5.9 × 9 = ?1 — what is the missing digit?
  6. 6.9 × 8 = ?2 — what is the missing digit?
  7. 7.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 42 (c) 49 (d) 48
  8. 8.Think of 14. Multiply it by 3, then add 1. What number do you end with?
  9. 9.43 × 4 =
  10. 10.What comes next? 11, 20, 29, 38, ? (a) 38 (b) 56 (c) 47 (d) 48
  11. 11.9 × 4 = 3? — what is the missing digit?
  12. 12.16 × 4 =
  13. 13.65 × 100 =
  14. 14.Magic square (every row, column and diagonal has the same total): 14 16 6 | 4 12 ? | 18 8 10. What is the missing number?
  15. 15.Magic trick! Think of 17. Double it, add 10, halve it, then take away 17. What number do you get?
  16. 16.297 + 792 =
  17. 17.27 × 4 =
  18. 18.9 × 3 = 2? — what is the missing digit?
  19. 19.6 × 1000 =
  20. 20.9 × 2 = ?8 — what is the missing digit?
  21. 21.Magic trick! Think of 11. Double it, add 12, halve it, then take away 11. What number do you get?
  22. 22.12345678 × 9 + 9 =
  23. 23.Take 784. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  24. 24.23 × 4 =
  25. 25.443 × 10 =
  26. 26.I thought of a number, added 7 and then doubled it. I got 48. What was my number?
  27. 27.The 1st of a month is a Wednesday. What day is the 20th of the same month? (a) Tuesday (b) Thursday (c) Sunday (d) Monday
  28. 28.Double 81 =
  29. 29.12345679 × 72 =
  30. 30.Magic trick! Think of 6. Double it, add 8, halve it, then take away 6. What number do you get?
  31. 31.?440 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Magic square (every row, column and diagonal has the same total): 17 7 ? | 19 15 11 | 9 23 13. What is the missing number?
  33. 33.1 + 3 + 5 + … + 27 =
  34. 34.If today is Thursday, what day was it 43 days ago? (a) Tuesday (b) Saturday (c) Thursday (d) Wednesday
  35. 35.What comes next? 6, 10, 14, 18, ? (a) 23 (b) 26 (c) 18 (d) 22
  36. 36.The ages of two twins add up to 12. How old is each twin?
  37. 37.Odd one out: which number is NOT in the 7 times table? (a) 14 (b) 28 (c) 42 (d) 33
  38. 38.Half of 84 =
  39. 39.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  40. 40.12345679 × 63 =

Answer key

  1. 63
  2. 198
  3. 11
  4. 5
  5. 8
  6. 7
  7. 48
  8. 43
  9. 172
  10. 47
  11. 6
  12. 64
  13. 6500
  14. 20
  15. 5
  16. 1089
  17. 108
  18. 7
  19. 6000
  20. 1
  21. 6
  22. 111111111
  23. 297
  24. 92
  25. 4430
  26. 17
  27. Monday
  28. 162
  29. 888888888
  30. 4
  31. 1
  32. 21
  33. 196
  34. Wednesday
  35. 22
  36. 6
  37. 33
  38. 42
  39. 594
  40. 777777777

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