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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 177 · 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.Double 64 =
  2. 2.522? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.41 × 4 =
  4. 4.21 × ? = 2100
  5. 5.What comes next? 20, 29, 38, 47, ? (a) 56 (b) 47 (c) 57 (d) 65
  6. 6.Half of 72 =
  7. 7.Magic square (every row, column and diagonal has the same total): 13 8 9 | 6 ? 14 | 11 12 7. What is the missing number?
  8. 8.Take 904. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  9. 9.5?72 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Magic square (every row, column and diagonal has the same total): 10 25 22 | 31 19 ? | 16 13 28. What is the missing number?
  11. 11.Double 21 =
  12. 12.37 × 3 =
  13. 13.A father is 44 years old and his son is 4. How old was the father when the son was born?
  14. 14.23 × 4 =
  15. 15.35 × 4 =
  16. 16.I thought of a number, multiplied it by 3 and added 3. I got 36. What was my number?
  17. 17.12 × 8 + 2 =
  18. 18.6 × 9 =
  19. 19.1 × 9 =
  20. 20.1 + 2 + 3 + … + 77 =
  21. 21.Think of 3. Multiply it by 2, then add 5. What number do you end with?
  22. 22.Half of 168 =
  23. 23.1111 × 1111 =
  24. 24.12345678 × 8 + 8 =
  25. 25.What comes next? 1, 4, 9, 16, ? (a) 27 (b) 23 (c) 26 (d) 25
  26. 26.Double 68 =
  27. 27.9 × 3 = ?7 — what is the missing digit?
  28. 28.A piggy bank has 7 coins of ₹5 and 4 coins of ₹2. How many rupees are in it?
  29. 29.Double 81 =
  30. 30.The ages of two twins add up to 16. How old is each twin?
  31. 31.I thought of a number, added 5 and then doubled it. I got 28. What was my number?
  32. 32.Double 79 =
  33. 33.Magic square (every row, column and diagonal has the same total): 7 8 3 | 2 6 ? | 9 4 5. What is the missing number?
  34. 34.Magic square (every row, column and diagonal has the same total): 11 6 7 | 4 8 12 | 9 10 ?. What is the missing number?
  35. 35.In 4 years a boy will be 12 years old. How old was he 5 years ago?
  36. 36.A girl is 8 years old and her brother is 4 years older. How old will her brother be in 3 years?
  37. 37.21 × 4 =
  38. 38.Magic square (every row, column and diagonal has the same total): 15 10 11 | ? 12 16 | 13 14 9. What is the missing number?
  39. 39.111 × 111 =
  40. 40.What comes next? 7, 16, 25, 34, ? (a) 44 (b) 34 (c) 43 (d) 52

Answer key

  1. 128
  2. 9
  3. 164
  4. 100
  5. 56
  6. 36
  7. 10
  8. 495
  9. 4
  10. 7
  11. 42
  12. 111
  13. 40
  14. 92
  15. 140
  16. 11
  17. 98
  18. 54
  19. 9
  20. 3003
  21. 11
  22. 84
  23. 1234321
  24. 98765432
  25. 25
  26. 136
  27. 2
  28. 43
  29. 162
  30. 8
  31. 9
  32. 158
  33. 10
  34. 5
  35. 3
  36. 15
  37. 84
  38. 8
  39. 12321
  40. 43

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