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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 211 · 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.Odd one out: which number is NOT in the 7 times table? (a) 35 (b) 21 (c) 60 (d) 56
  2. 2.Half of 162 =
  3. 3.16 × 4 =
  4. 4.I thought of a number, multiplied it by 5 and added 5. I got 60. What was my number?
  5. 5.I thought of a number, multiplied it by 5 and added 1. I got 36. What was my number?
  6. 6.9 × 10 =
  7. 7.A piggy bank has 9 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
  8. 8.I thought of a number, added 1 and then doubled it. I got 34. What was my number?
  9. 9.Double 46 =
  10. 10.1 + 3 + 5 + … + 41 =
  11. 11.3 × 9 =
  12. 12.?496 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.48 × 4 =
  14. 14.17 × ? = 17000
  15. 15.I thought of a number, added 9 and then doubled it. I got 30. What was my number?
  16. 16.A father is 36 years old and his son is 14. How old was the father when the son was born?
  17. 17.The ages of two twins add up to 20. How old is each twin?
  18. 18.195 × ? = 1950
  19. 19.9 × 6 = ?4 — what is the missing digit?
  20. 20.Magic square (every row, column and diagonal has the same total): 11 6 7 | 4 8 ? | 9 10 5. What is the missing number?
  21. 21.In 3 years a boy will be 14 years old. How old was he 6 years ago?
  22. 22.What comes next? 1, 4, 9, 16, ? (a) 26 (b) 25 (c) 27 (d) 23
  23. 23.Magic square (every row, column and diagonal has the same total): 33 12 27 | 18 ? 30 | 21 36 15. What is the missing number?
  24. 24.17 × 4 =
  25. 25.43 × 100 =
  26. 26.1 + 3 + 5 + … + 27 =
  27. 27.9 × 2 =
  28. 28.Magic square (every row, column and diagonal has the same total): 21 ? 13 | 11 19 27 | 25 15 17. What is the missing number?
  29. 29.287 × 10 =
  30. 30.Magic square (every row, column and diagonal has the same total): ? 30 15 | 12 24 36 | 33 18 21. What is the missing number?
  31. 31.In 4 years a boy will be 16 years old. How old was he 4 years ago?
  32. 32.If today is Wednesday, what day was it 56 days ago? (a) Wednesday (b) Saturday (c) Tuesday (d) Thursday
  33. 33.1 + 2 + 3 + … + 88 =
  34. 34.If today is Tuesday, what day was it 40 days ago? (a) Sunday (b) Wednesday (c) Thursday (d) Friday
  35. 35.1234567 × 8 + 7 =
  36. 36.123 × 9 + 4 =
  37. 37.36 × 4 =
  38. 38.3?57 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.12345679 × 36 =
  40. 40.Magic square (every row, column and diagonal has the same total): 7 28 13 | 22 16 10 | 19 ? 25. What is the missing number?

Answer key

  1. 60
  2. 81
  3. 64
  4. 11
  5. 7
  6. 90
  7. 75
  8. 16
  9. 92
  10. 441
  11. 27
  12. 8
  13. 192
  14. 1000
  15. 6
  16. 22
  17. 10
  18. 10
  19. 5
  20. 12
  21. 5
  22. 25
  23. 24
  24. 68
  25. 4300
  26. 196
  27. 18
  28. 23
  29. 2870
  30. 27
  31. 8
  32. Wednesday
  33. 3916
  34. Thursday
  35. 9876543
  36. 1111
  37. 144
  38. 3
  39. 444444444
  40. 4

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