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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 699 · 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.What comes next? 1, 4, 9, 16, ? (a) 23 (b) 26 (c) 27 (d) 25
  2. 2.?640 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.123456 × 9 + 7 =
  4. 4.11 × 4 =
  5. 5.43 × ? = 4300
  6. 6.Take 813. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  7. 7.Take 482. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  8. 8.If today is Tuesday, what day was it 35 days ago? (a) Friday (b) Monday (c) Tuesday (d) Wednesday
  9. 9.Take 931. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  10. 10.38 × ? = 3800
  11. 11.3 × 9 =
  12. 12.Double 64 =
  13. 13.396 + 693 =
  14. 14.5?24 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.9 × 5 = ?5 — what is the missing digit?
  16. 16.8 × 4 =
  17. 17.18 × 4 =
  18. 18.If today is Monday, what day will it be after 39 days? (a) Monday (b) Thursday (c) Saturday (d) Friday
  19. 19.9 × 8 = ?2 — what is the missing digit?
  20. 20.A piggy bank has 6 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?
  21. 21.Double 68 =
  22. 22.The ages of two twins add up to 8. How old is each twin?
  23. 23.Take 139. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  24. 24.7?92 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Do the 1089 trick with 245: reverse and subtract, then reverse that answer and add. What do you get?
  26. 26.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
  27. 27.2?21 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.44 × ? = 44000
  29. 29.11111 × 11111 =
  30. 30.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  31. 31.6 × 9 =
  32. 32.12345679 × 27 =
  33. 33.123 × 8 + 3 =
  34. 34.What comes next? 4, 9, 16, 25, ? (a) 36 (b) 38 (c) 37 (d) 34
  35. 35.55 × ? = 5500
  36. 36.9 × 1 =
  37. 37.The 6th of a month is a Sunday. What day is the 25th of the same month? (a) Saturday (b) Friday (c) Monday (d) Thursday
  38. 38.What comes next? 36, 49, 64, 81, ? (a) 98 (b) 102 (c) 101 (d) 100
  39. 39.Magic trick! Think of 8. Double it, add 16, halve it, then take away 8. What number do you get?
  40. 40.?091 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 25
  2. 8
  3. 1111111
  4. 44
  5. 100
  6. 495
  7. 198
  8. Tuesday
  9. 792
  10. 100
  11. 27
  12. 128
  13. 1089
  14. 7
  15. 4
  16. 32
  17. 72
  18. Friday
  19. 7
  20. 36
  21. 136
  22. 4
  23. 792
  24. 9
  25. 1089
  26. 6
  27. 4
  28. 1000
  29. 123454321
  30. 792
  31. 54
  32. 333333333
  33. 987
  34. 36
  35. 100
  36. 9
  37. Friday
  38. 100
  39. 8
  40. 8

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