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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 113 · 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. 1.10 × 4 =
  2. 2.35 × 4 =
  3. 3.What comes next? 10, 16, 22, 28, ? (a) 28 (b) 34 (c) 35 (d) 40
  4. 4.46?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.9 × 5 = ?5 — what is the missing digit?
  6. 6.Take 47 and take away the sum of its digits. What do you get?
  7. 7.Half of 28 =
  8. 8.Double 94 =
  9. 9.Double 58 =
  10. 10.12345 × 9 + 6 =
  11. 11.9 × 9 =
  12. 12.Double 47 =
  13. 13.If today is Wednesday, what day will it be after 83 days? (a) Tuesday (b) Monday (c) Wednesday (d) Friday
  14. 14.Double 61 =
  15. 15.In 5 years a boy will be 17 years old. How old was he 2 years ago?
  16. 16.Magic trick! Think of 13. Double it, add 8, halve it, then take away 13. What number do you get?
  17. 17.Double 43 =
  18. 18.24 × 4 =
  19. 19.37 × 15 =
  20. 20.4 × 9 =
  21. 21.Magic square (every row, column and diagonal has the same total): 8 9 4 | 3 7 11 | 10 ? 6. What is the missing number?
  22. 22.1 + 2 + 3 + … + 19 =
  23. 23.Odd one out: which number is NOT in the 6 times table? (a) 12 (b) 30 (c) 23 (d) 24
  24. 24.37 × ? = 3700
  25. 25.A piggy bank has 7 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
  26. 26.Half of 108 =
  27. 27.1 + 2 + 3 + … + 45 =
  28. 28.I thought of a number, multiplied it by 4 and added 7. I got 59. What was my number?
  29. 29.1 + 2 + 3 + … + 58 =
  30. 30.1111 × 1111 =
  31. 31.9 × 4 = ?6 — what is the missing digit?
  32. 32.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
  33. 33.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  34. 34.130 × ? = 1300
  35. 35.A piggy bank has 6 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
  36. 36.9 × 7 = ?3 — what is the missing digit?
  37. 37.The ages of two twins add up to 16. How old is each twin?
  38. 38.9 × 3 = ?7 — what is the missing digit?
  39. 39.13 × 100 =
  40. 40.Take 83 and take away the sum of its digits. What do you get?

Answer key

  1. 40
  2. 140
  3. 34
  4. 9
  5. 4
  6. 36
  7. 14
  8. 188
  9. 116
  10. 111111
  11. 81
  12. 94
  13. Tuesday
  14. 122
  15. 10
  16. 4
  17. 86
  18. 96
  19. 555
  20. 36
  21. 5
  22. 190
  23. 23
  24. 100
  25. 49
  26. 54
  27. 1035
  28. 13
  29. 1711
  30. 1234321
  31. 3
  32. 6
  33. 594
  34. 10
  35. 60
  36. 6
  37. 8
  38. 2
  39. 1300
  40. 72

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