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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 240 · 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. 1.788 × 10 =
  2. 2.A father is 33 years old and his son is 5. How old was the father when the son was born?
  3. 3.9 × 10 = 9? — what is the missing digit?
  4. 4.Take 649. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  5. 5.37 × 27 =
  6. 6.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 42 (c) 48 (d) 49
  7. 7.The ages of two twins add up to 18. How old is each twin?
  8. 8.35 × 4 =
  9. 9.Take 47 and take away the sum of its digits. What do you get?
  10. 10.1 + 2 + 3 + … + 19 =
  11. 11.9 × 4 = 3? — what is the missing digit?
  12. 12.I thought of a number, added 2 and then doubled it. I got 16. What was my number?
  13. 13.What comes next? 6, 11, 16, 21, ? (a) 21 (b) 26 (c) 27 (d) 31
  14. 14.Odd one out: which number is NOT in the 3 times table? (a) 18 (b) 9 (c) 24 (d) 13
  15. 15.Odd one out: which number is NOT in the 8 times table? (a) 39 (b) 48 (c) 24 (d) 40
  16. 16.Odd one out: which number is NOT in the 9 times table? (a) 36 (b) 45 (c) 77 (d) 54
  17. 17.9 × 9 = 8? — what is the missing digit?
  18. 18.What comes next? 2, 4, 8, 16, ? (a) 28 (b) 24 (c) 32 (d) 33
  19. 19.44 × 4 =
  20. 20.Magic square (every row, column and diagonal has the same total): 10 24 ? | 20 16 12 | 18 8 22. What is the missing number?
  21. 21.What comes next? 4, 8, 16, 32, ? (a) 65 (b) 48 (c) 56 (d) 64
  22. 22.A piggy bank has 3 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
  23. 23.Double 49 =
  24. 24.36 × 4 =
  25. 25.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  26. 26.A father is 44 years old and his son is 11. How old was the father when the son was born?
  27. 27.32 × ? = 32000
  28. 28.Take 95 and take away the sum of its digits. What do you get?
  29. 29.9 × 6 = 5? — what is the missing digit?
  30. 30.8?92 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.8 × 4 =
  32. 32.What comes next? 1, 5, 9, 13, ? (a) 18 (b) 13 (c) 17 (d) 21
  33. 33.Magic square (every row, column and diagonal has the same total): 16 31 10 | 13 19 ? | 28 7 22. What is the missing number?
  34. 34.A father is 39 years old and his son is 12. How old was the father when the son was born?
  35. 35.9 × 7 = 6? — what is the missing digit?
  36. 36.What comes next? 8, 11, 14, 17, ? (a) 23 (b) 17 (c) 21 (d) 20
  37. 37.9 × 5 = 4? — what is the missing digit?
  38. 38.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  39. 39.920 × 10 =
  40. 40.If today is Sunday, what day was it 10 days ago? (a) Thursday (b) Wednesday (c) Friday (d) Sunday

Answer key

  1. 7880
  2. 28
  3. 0
  4. 297
  5. 999
  6. 48
  7. 9
  8. 140
  9. 36
  10. 190
  11. 6
  12. 6
  13. 26
  14. 13
  15. 39
  16. 77
  17. 1
  18. 32
  19. 176
  20. 14
  21. 64
  22. 29
  23. 98
  24. 144
  25. 198
  26. 33
  27. 1000
  28. 81
  29. 4
  30. 8
  31. 32
  32. 17
  33. 25
  34. 27
  35. 3
  36. 20
  37. 5
  38. 891
  39. 9200
  40. Thursday

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