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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 167 · 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 trick! Think of 3. Double it, add 10, halve it, then take away 3. What number do you get?
  2. 2.What comes next? 3, 9, 15, 21, ? (a) 28 (b) 33 (c) 27 (d) 21
  3. 3.9 × 2 = 1? — what is the missing digit?
  4. 4.Magic square (every row, column and diagonal has the same total): 18 ? 12 | 15 21 27 | 30 9 24. What is the missing number?
  5. 5.9 × 9 =
  6. 6.12345678 × 8 + 8 =
  7. 7.Magic square (every row, column and diagonal has the same total): 11 6 13 | 12 10 8 | 7 14 ?. What is the missing number?
  8. 8.58 × 4 =
  9. 9.8 × 9 =
  10. 10.9 × 7 = 6? — what is the missing digit?
  11. 11.41 × 4 =
  12. 12.Magic square (every row, column and diagonal has the same total): 12 7 8 | 5 9 13 | 10 ? 6. What is the missing number?
  13. 13.6?55 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.What comes next? 4, 9, 16, 25, ? (a) 38 (b) 37 (c) 36 (d) 34
  15. 15.8 × 4 =
  16. 16.9 × 4 =
  17. 17.A piggy bank has 7 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
  18. 18.Double 62 =
  19. 19.A piggy bank has 5 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
  20. 20.1 + 2 + 3 + … + 16 =
  21. 21.1 + 2 + 3 + … + 25 =
  22. 22.66 × 100 =
  23. 23.Magic square (every row, column and diagonal has the same total): 19 22 7 | 4 16 28 | ? 10 13. What is the missing number?
  24. 24.If today is Monday, what day will it be after 37 days? (a) Saturday (b) Tuesday (c) Wednesday (d) Thursday
  25. 25.10 × 9 =
  26. 26.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  27. 27.Magic square (every row, column and diagonal has the same total): 32 17 20 | 11 23 35 | 26 ? 14. What is the missing number?
  28. 28.Take 862. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  29. 29.60 × 4 =
  30. 30.1?62 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.9 × 6 = ?4 — what is the missing digit?
  32. 32.51 × 4 =
  33. 33.9 × 3 = ?7 — what is the missing digit?
  34. 34.1 + 2 + 3 + … + 32 =
  35. 35.12345 × 8 + 5 =
  36. 36.9 × 3 = 2? — what is the missing digit?
  37. 37.Take 816. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  38. 38.?407 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.If today is Thursday, what day will it be after 95 days? (a) Thursday (b) Monday (c) Tuesday (d) Sunday
  40. 40.The ages of two twins add up to 24. How old is each twin?

Answer key

  1. 5
  2. 27
  3. 8
  4. 33
  5. 81
  6. 98765432
  7. 9
  8. 232
  9. 72
  10. 3
  11. 164
  12. 11
  13. 2
  14. 36
  15. 32
  16. 36
  17. 45
  18. 124
  19. 53
  20. 136
  21. 325
  22. 6600
  23. 25
  24. Wednesday
  25. 90
  26. 594
  27. 29
  28. 594
  29. 240
  30. 9
  31. 5
  32. 204
  33. 2
  34. 528
  35. 98765
  36. 7
  37. 198
  38. 7
  39. Monday
  40. 12

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