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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 379 · 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.Magic square (every row, column and diagonal has the same total): 4 9 8 | 11 7 3 | ? 5 10. What is the missing number?
  2. 2.9 × 3 = ?7 — what is the missing digit?
  3. 3.12345679 × 63 =
  4. 4.1 + 2 + 3 + … + 53 =
  5. 5.Half of 158 =
  6. 6.Magic square (every row, column and diagonal has the same total): ? 10 15 | 12 14 16 | 13 18 11. What is the missing number?
  7. 7.9 × 6 =
  8. 8.Magic square (every row, column and diagonal has the same total): 11 21 ? | 9 13 17 | 19 5 15. What is the missing number?
  9. 9.Double 49 =
  10. 10.9 × 4 = ?6 — what is the missing digit?
  11. 11.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  12. 12.Do the 1089 trick with 609: reverse and subtract, then reverse that answer and add. What do you get?
  13. 13.26 × 1000 =
  14. 14.39 × 4 =
  15. 15.If today is Monday, what day was it 15 days ago? (a) Wednesday (b) Sunday (c) Monday (d) Saturday
  16. 16.?754 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Magic square (every row, column and diagonal has the same total): 8 9 4 | 3 7 ? | 10 5 6. What is the missing number?
  18. 18.13 × 4 =
  19. 19.9 × 3 =
  20. 20.I thought of a number, multiplied it by 3 and added 7. I got 31. What was my number?
  21. 21.37 × 21 =
  22. 22.If today is Tuesday, what day will it be after 49 days? (a) Wednesday (b) Monday (c) Tuesday (d) Friday
  23. 23.924 × ? = 9240
  24. 24.9 × 3 = 2? — what is the missing digit?
  25. 25.?269 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.The ages of two twins add up to 20. How old is each twin?
  27. 27.I thought of a number, added 7 and then doubled it. I got 36. What was my number?
  28. 28.A piggy bank has 3 coins of ₹5 and 8 coins of ₹2. How many rupees are in it?
  29. 29.Half of 134 =
  30. 30.Magic square (every row, column and diagonal has the same total): 12 2 16 | 14 10 6 | 4 ? 8. What is the missing number?
  31. 31.The 7th of a month is a Monday. What day is the 30th of the same month? (a) Wednesday (b) Saturday (c) Thursday (d) Tuesday
  32. 32.If today is Monday, what day will it be after 57 days? (a) Tuesday (b) Friday (c) Monday (d) Wednesday
  33. 33.45 × 4 =
  34. 34.38 × 4 =
  35. 35.9 × 10 = ?0 — what is the missing digit?
  36. 36.What comes next? 1, 2, 4, 8, ? (a) 16 (b) 17 (c) 12 (d) 14
  37. 37.If today is Monday, what day was it 10 days ago? (a) Thursday (b) Friday (c) Saturday (d) Monday
  38. 38.167 × 10 =
  39. 39.883 × ? = 8830
  40. 40.Magic square (every row, column and diagonal has the same total): 4 18 8 | ? 10 6 | 12 2 16. What is the missing number?

Answer key

  1. 6
  2. 2
  3. 777777777
  4. 1431
  5. 79
  6. 17
  7. 54
  8. 7
  9. 98
  10. 3
  11. 891
  12. 1089
  13. 26000
  14. 156
  15. Sunday
  16. 2
  17. 11
  18. 52
  19. 27
  20. 8
  21. 777
  22. Tuesday
  23. 10
  24. 7
  25. 1
  26. 10
  27. 11
  28. 31
  29. 67
  30. 18
  31. Wednesday
  32. Tuesday
  33. 180
  34. 152
  35. 9
  36. 16
  37. Friday
  38. 1670
  39. 10
  40. 14

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