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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 266 · 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.Take 81 and take away the sum of its digits. What do you get?
  2. 2.A piggy bank has 3 coins of ₹5 and 8 coins of ₹2. How many rupees are in it?
  3. 3.1 + 2 + 3 + … + 7 =
  4. 4.The 2nd of a month is a Sunday. What day is the 12th of the same month? (a) Tuesday (b) Thursday (c) Saturday (d) Wednesday
  5. 5.12345679 × 9 =
  6. 6.17 × 4 =
  7. 7.37 × 15 =
  8. 8.1 + 2 + 3 + … + 16 =
  9. 9.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 36 (c) 42 (d) 48
  10. 10.What comes next? 7, 10, 13, 16, ? (a) 20 (b) 16 (c) 22 (d) 19
  11. 11.Take 259. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  12. 12.9 × 3 =
  13. 13.1234 × 9 + 5 =
  14. 14.9 × 10 = ?0 — what is the missing digit?
  15. 15.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹14. How many ₹2 coins do you have?
  16. 16.9 × 9 = ?1 — what is the missing digit?
  17. 17.43 × 4 =
  18. 18.I thought of a number, added 7 and then doubled it. I got 32. What was my number?
  19. 19.What comes next? 16, 25, 36, 49, ? (a) 66 (b) 64 (c) 65 (d) 62
  20. 20.9 × 7 = ?3 — what is the missing digit?
  21. 21.37 × 21 =
  22. 22.34 × 4 =
  23. 23.What comes next? 4, 7, 10, 13, ? (a) 17 (b) 13 (c) 16 (d) 19
  24. 24.9 × 5 = ?5 — what is the missing digit?
  25. 25.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹14. How many ₹2 coins do you have?
  26. 26.43 × ? = 4300
  27. 27.Think of 4. Multiply it by 4, then add 5. What number do you end with?
  28. 28.Double 91 =
  29. 29.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  30. 30.187 × ? = 1870
  31. 31.Half of 46 =
  32. 32.16 × 4 =
  33. 33.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  34. 34.Magic square (every row, column and diagonal has the same total): ? 3 24 | 21 15 9 | 6 27 12. What is the missing number?
  35. 35.Odd one out: which number is NOT in the 8 times table? (a) 40 (b) 19 (c) 24 (d) 32
  36. 36.1 + 3 + 5 + … + 49 =
  37. 37.608 × ? = 6080
  38. 38.1111 × 1111 =
  39. 39.9 × 4 =
  40. 40.1 + 2 + 3 + … + 12 =

Answer key

  1. 72
  2. 31
  3. 28
  4. Wednesday
  5. 111111111
  6. 68
  7. 555
  8. 136
  9. 48
  10. 19
  11. 693
  12. 27
  13. 11111
  14. 9
  15. 2
  16. 8
  17. 172
  18. 9
  19. 64
  20. 6
  21. 777
  22. 136
  23. 16
  24. 4
  25. 5
  26. 100
  27. 21
  28. 182
  29. 891
  30. 10
  31. 23
  32. 64
  33. 297
  34. 18
  35. 19
  36. 625
  37. 10
  38. 1234321
  39. 36
  40. 78

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