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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 462 · 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. 1.1 + 3 + 5 + … + 19 =
  2. 2.29 × 4 =
  3. 3.Half of 46 =
  4. 4.Double 51 =
  5. 5.12345679 × 18 =
  6. 6.In 6 years a boy will be 15 years old. How old was he 4 years ago?
  7. 7.75 × 100 =
  8. 8.770 × 10 =
  9. 9.41 × 4 =
  10. 10.1 + 2 + 3 + … + 7 =
  11. 11.396 + 693 =
  12. 12.148? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Half of 72 =
  14. 14.Magic square (every row, column and diagonal has the same total): 7 22 ? | 28 16 4 | 13 10 25. What is the missing number?
  15. 15.Magic square (every row, column and diagonal has the same total): 10 20 6 | 8 12 16 | 18 4 ?. What is the missing number?
  16. 16.297 + 792 =
  17. 17.13 × 4 =
  18. 18.57 × 4 =
  19. 19.33?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.1 + 3 + 5 + … + 49 =
  21. 21.I thought of a number, multiplied it by 5 and added 4. I got 24. What was my number?
  22. 22.1234 × 9 + 5 =
  23. 23.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  24. 24.198 + 891 =
  25. 25.The 5th of a month is a Thursday. What day is the 30th of the same month? (a) Sunday (b) Thursday (c) Monday (d) Tuesday
  26. 26.29 × ? = 290
  27. 27.Magic square (every row, column and diagonal has the same total): 12 27 6 | 9 15 ? | 24 3 18. What is the missing number?
  28. 28.6 × 9 =
  29. 29.86 × ? = 8600
  30. 30.Magic trick! Think of 4. Double it, add 6, halve it, then take away 4. What number do you get?
  31. 31.Double 79 =
  32. 32.The 2nd of a month is a Thursday. What day is the 29th of the same month? (a) Saturday (b) Thursday (c) Wednesday (d) Tuesday
  33. 33.2?81 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.A piggy bank has 9 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?
  35. 35.Take 764. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  36. 36.Odd one out: which number is NOT in the 6 times table? (a) 36 (b) 18 (c) 48 (d) 32
  37. 37.The 2nd of a month is a Wednesday. What day is the 13th of the same month? (a) Monday (b) Saturday (c) Sunday (d) Wednesday
  38. 38.What comes next? 1, 4, 9, 16, ? (a) 25 (b) 26 (c) 27 (d) 23
  39. 39.1 + 2 + 3 + … + 29 =
  40. 40.?520 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 100
  2. 116
  3. 23
  4. 102
  5. 222222222
  6. 5
  7. 7500
  8. 7700
  9. 164
  10. 28
  11. 1089
  12. 5
  13. 36
  14. 19
  15. 14
  16. 1089
  17. 52
  18. 228
  19. 5
  20. 625
  21. 4
  22. 11111
  23. 693
  24. 1089
  25. Monday
  26. 10
  27. 21
  28. 54
  29. 100
  30. 3
  31. 158
  32. Wednesday
  33. 7
  34. 51
  35. 297
  36. 32
  37. Sunday
  38. 25
  39. 435
  40. 2

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