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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 156 · 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. 1.57?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.119? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.351 × ? = 3510
  4. 4.8 × 9 =
  5. 5.Think of 15. Multiply it by 2, then add 2. What number do you end with?
  6. 6.9 × 5 = ?5 — what is the missing digit?
  7. 7.Magic square (every row, column and diagonal has the same total): 9 30 15 | 24 18 12 | 21 ? 27. What is the missing number?
  8. 8.A piggy bank has 6 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
  9. 9.Think of 4. Multiply it by 2, then add 7. What number do you end with?
  10. 10.What comes next? 2, 5, 8, 11, ? (a) 14 (b) 11 (c) 15 (d) 17
  11. 11.21 × ? = 2100
  12. 12.1 + 2 + 3 + … + 26 =
  13. 13.1 + 3 + 5 + … + 23 =
  14. 14.In 2 years a boy will be 13 years old. How old was he 4 years ago?
  15. 15.416 × 10 =
  16. 16.28 × 1000 =
  17. 17.What comes next? 2, 4, 8, 16, ? (a) 28 (b) 24 (c) 33 (d) 32
  18. 18.123456 × 9 + 7 =
  19. 19.9 × 6 = ?4 — what is the missing digit?
  20. 20.902 × 10 =
  21. 21.Magic square (every row, column and diagonal has the same total): 9 2 7 | ? 6 8 | 5 10 3. What is the missing number?
  22. 22.795 × 10 =
  23. 23.Magic square (every row, column and diagonal has the same total): 6 16 14 | 20 12 4 | 10 8 ?. What is the missing number?
  24. 24.What comes next? 19, 26, 33, 40, ? (a) 54 (b) 48 (c) 40 (d) 47
  25. 25.I thought of a number, multiplied it by 2 and added 5. I got 9. What was my number?
  26. 26.A father is 32 years old and his son is 9. How old was the father when the son was born?
  27. 27.What comes next? 5, 10, 20, 40, ? (a) 80 (b) 81 (c) 70 (d) 60
  28. 28.11111 × 11111 =
  29. 29.9 × 3 = ?7 — what is the missing digit?
  30. 30.9 × 6 = 5? — what is the missing digit?
  31. 31.Do the 1089 trick with 579: reverse and subtract, then reverse that answer and add. What do you get?
  32. 32.9 × 9 =
  33. 33.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 49 (c) 50 (d) 51
  34. 34.You have 10 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
  35. 35.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 17 (c) 16 (d) 14
  36. 36.Magic square (every row, column and diagonal has the same total): 14 ? 18 | 16 12 8 | 6 20 10. What is the missing number?
  37. 37.What comes next? 1, 6, 11, 16, ? (a) 16 (b) 26 (c) 22 (d) 21
  38. 38.1111 × 1111 =
  39. 39.721 × 10 =
  40. 40.?220 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 6
  2. 7
  3. 10
  4. 72
  5. 32
  6. 4
  7. 6
  8. 56
  9. 15
  10. 14
  11. 100
  12. 351
  13. 144
  14. 7
  15. 4160
  16. 28000
  17. 32
  18. 1111111
  19. 5
  20. 9020
  21. 4
  22. 7950
  23. 18
  24. 47
  25. 2
  26. 23
  27. 80
  28. 123454321
  29. 2
  30. 4
  31. 1089
  32. 81
  33. 49
  34. 3
  35. 16
  36. 4
  37. 21
  38. 1234321
  39. 7210
  40. 5

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