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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 632 · 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.Double 19 =
  2. 2.213 × ? = 2130
  3. 3.843? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.A girl is 8 years old and her brother is 6 years older. How old will her brother be in 5 years?
  5. 5.Odd one out: which number is NOT in the 9 times table? (a) 73 (b) 18 (c) 27 (d) 36
  6. 6.The ages of two twins add up to 22. How old is each twin?
  7. 7.1 + 2 + 3 + … + 50 =
  8. 8.If today is Sunday, what day will it be after 33 days? (a) Monday (b) Thursday (c) Saturday (d) Friday
  9. 9.120? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.9 × 5 =
  11. 11.Take 49 and take away the sum of its digits. What do you get?
  12. 12.1?65 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.46 × 4 =
  14. 14.58 × 4 =
  15. 15.13 × 4 =
  16. 16.9 × 2 =
  17. 17.Half of 98 =
  18. 18.A girl is 12 years old and her brother is 5 years older. How old will her brother be in 3 years?
  19. 19.I thought of a number, multiplied it by 2 and added 5. I got 27. What was my number?
  20. 20.Magic trick! Think of 19. Double it, add 6, halve it, then take away 19. What number do you get?
  21. 21.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹16. How many ₹2 coins do you have?
  22. 22.1 + 2 + 3 + … + 9 =
  23. 23.If today is Saturday, what day was it 46 days ago? (a) Tuesday (b) Monday (c) Friday (d) Wednesday
  24. 24.5?34 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.A piggy bank has 10 coins of ₹5 and 10 coins of ₹2. How many rupees are in it?
  26. 26.40 × 4 =
  27. 27.Take 950. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  28. 28.Magic square (every row, column and diagonal has the same total): 7 21 11 | 17 13 9 | ? 5 19. What is the missing number?
  29. 29.Magic square (every row, column and diagonal has the same total): 10 25 ? | 31 19 7 | 16 13 28. What is the missing number?
  30. 30.I thought of a number, multiplied it by 5 and added 3. I got 53. What was my number?
  31. 31.Magic square (every row, column and diagonal has the same total): 7 6 11 | 12 8 4 | 5 ? 9. What is the missing number?
  32. 32.Magic trick! Think of 20. Double it, add 8, halve it, then take away 20. What number do you get?
  33. 33.59 × 4 =
  34. 34.8 × ? = 8000
  35. 35.9 × 5 = ?5 — what is the missing digit?
  36. 36.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
  37. 37.Double 81 =
  38. 38.9 × 6 = 5? — what is the missing digit?
  39. 39.Magic square (every row, column and diagonal has the same total): 8 ? 10 | 9 7 5 | 4 11 6. What is the missing number?
  40. 40.22 × 4 =

Answer key

  1. 38
  2. 10
  3. 3
  4. 19
  5. 73
  6. 11
  7. 1275
  8. Friday
  9. 6
  10. 45
  11. 36
  12. 6
  13. 184
  14. 232
  15. 52
  16. 18
  17. 49
  18. 20
  19. 11
  20. 3
  21. 2
  22. 45
  23. Tuesday
  24. 6
  25. 70
  26. 160
  27. 891
  28. 15
  29. 22
  30. 10
  31. 10
  32. 4
  33. 236
  34. 1000
  35. 4
  36. 4
  37. 162
  38. 4
  39. 3
  40. 88

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