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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 498 · 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. 1.26 × 1000 =
  2. 2.9 × 3 = ?7 — what is the missing digit?
  3. 3.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  4. 4.Double 67 =
  5. 5.Magic trick! Think of 10. Double it, add 10, halve it, then take away 10. What number do you get?
  6. 6.Half of 62 =
  7. 7.123 × 9 + 4 =
  8. 8.495 + 594 =
  9. 9.9 × 4 = ?6 — what is the missing digit?
  10. 10.12345679 × 54 =
  11. 11.If today is Wednesday, what day was it 52 days ago? (a) Saturday (b) Sunday (c) Monday (d) Wednesday
  12. 12.9 × 3 =
  13. 13.30 × 4 =
  14. 14.?143 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹15. How many ₹2 coins do you have?
  16. 16.Take 900. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  17. 17.7 × 9 =
  18. 18.If today is Saturday, what day will it be after 68 days? (a) Thursday (b) Wednesday (c) Sunday (d) Friday
  19. 19.A piggy bank has 4 coins of ₹5 and 6 coins of ₹2. How many rupees are in it?
  20. 20.The ages of two twins add up to 28. How old is each twin?
  21. 21.I thought of a number, added 4 and then doubled it. I got 28. What was my number?
  22. 22.49 × ? = 4900
  23. 23.Think of 15. Multiply it by 5, then add 9. What number do you end with?
  24. 24.Take 32 and take away the sum of its digits. What do you get?
  25. 25.594 + 495 =
  26. 26.Magic square (every row, column and diagonal has the same total): 21 7 17 | 11 15 ? | 13 23 9. What is the missing number?
  27. 27.123456 × 9 + 7 =
  28. 28.What comes next? 6, 12, 18, 24, ? (a) 31 (b) 24 (c) 36 (d) 30
  29. 29.693 + 396 =
  30. 30.Half of 148 =
  31. 31.45 × 100 =
  32. 32.9 × 6 = ?4 — what is the missing digit?
  33. 33.Double 83 =
  34. 34.1 + 2 + 3 + … + 6 =
  35. 35.8 × 9 =
  36. 36.892 × 10 =
  37. 37.9 × 8 = ?2 — what is the missing digit?
  38. 38.57 × 4 =
  39. 39.33 × 4 =
  40. 40.If today is Sunday, what day will it be after 70 days? (a) Monday (b) Saturday (c) Sunday (d) Wednesday

Answer key

  1. 26000
  2. 2
  3. 198
  4. 134
  5. 5
  6. 31
  7. 1111
  8. 1089
  9. 3
  10. 666666666
  11. Sunday
  12. 27
  13. 120
  14. 1
  15. 6
  16. 891
  17. 63
  18. Thursday
  19. 32
  20. 14
  21. 10
  22. 100
  23. 84
  24. 27
  25. 1089
  26. 19
  27. 1111111
  28. 30
  29. 1089
  30. 74
  31. 4500
  32. 5
  33. 166
  34. 21
  35. 72
  36. 8920
  37. 7
  38. 228
  39. 132
  40. Sunday

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