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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 85 · 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.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹6. How many ₹2 coins do you have?
  2. 2.Magic square (every row, column and diagonal has the same total): 6 20 10 | 16 12 8 | 14 ? 18. What is the missing number?
  3. 3.Take 755. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  4. 4.9 × 4 = ?6 — what is the missing digit?
  5. 5.What comes next? 1, 8, 15, 22, ? (a) 30 (b) 22 (c) 36 (d) 29
  6. 6.104 × ? = 1040
  7. 7.What comes next? 3, 5, 7, 9, ? (a) 13 (b) 12 (c) 9 (d) 11
  8. 8.Half of 42 =
  9. 9.9 × 9 = ?1 — what is the missing digit?
  10. 10.9 × 6 = ?4 — what is the missing digit?
  11. 11.Half of 66 =
  12. 12.Take 199. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  13. 13.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 70 (c) 60 (d) 80
  14. 14.In 6 years a boy will be 19 years old. How old was he 6 years ago?
  15. 15.Magic square (every row, column and diagonal has the same total): 10 20 18 | 24 16 8 | 14 12 ?. What is the missing number?
  16. 16.Take 927. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  17. 17.9 × 2 =
  18. 18.12 × 4 =
  19. 19.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹8. How many ₹2 coins do you have?
  20. 20.1 + 3 + 5 + … + 23 =
  21. 21.9 × 2 = 1? — what is the missing digit?
  22. 22.Half of 172 =
  23. 23.1 + 2 + 3 + … + 45 =
  24. 24.9 × 4 =
  25. 25.A piggy bank has 11 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?
  26. 26.Magic square (every row, column and diagonal has the same total): 17 32 ? | 14 20 26 | 29 8 23. What is the missing number?
  27. 27.Half of 58 =
  28. 28.46 × 1000 =
  29. 29.37 × 4 =
  30. 30.Think of 2. Multiply it by 5, then add 3. What number do you end with?
  31. 31.1 + 2 + 3 + … + 43 =
  32. 32.Magic square (every row, column and diagonal has the same total): 27 30 ? | 12 24 36 | 33 18 21. What is the missing number?
  33. 33.36?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Think of 4. Multiply it by 4, then add 9. What number do you end with?
  35. 35.1234 × 9 + 5 =
  36. 36.9 × 9 =
  37. 37.Magic square (every row, column and diagonal has the same total): ? 9 4 | 3 7 11 | 10 5 6. What is the missing number?
  38. 38.Magic trick! Think of 8. Double it, add 4, halve it, then take away 8. What number do you get?
  39. 39.I thought of a number, added 5 and then doubled it. I got 22. What was my number?
  40. 40.1 + 2 + 3 + … + 66 =

Answer key

  1. 1
  2. 4
  3. 198
  4. 3
  5. 29
  6. 10
  7. 11
  8. 21
  9. 8
  10. 5
  11. 33
  12. 792
  13. 80
  14. 7
  15. 22
  16. 198
  17. 18
  18. 48
  19. 1
  20. 144
  21. 8
  22. 86
  23. 1035
  24. 36
  25. 61
  26. 11
  27. 29
  28. 46000
  29. 148
  30. 13
  31. 946
  32. 15
  33. 9
  34. 25
  35. 11111
  36. 81
  37. 8
  38. 2
  39. 6
  40. 2211

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