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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 863 · 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. 1.13 × 4 =
  2. 2.22 × 4 =
  3. 3.26 × 4 =
  4. 4.12345679 × 36 =
  5. 5.Do the 1089 trick with 450: reverse and subtract, then reverse that answer and add. What do you get?
  6. 6.Magic square (every row, column and diagonal has the same total): 11 4 ? | 6 8 10 | 7 12 5. What is the missing number?
  7. 7.6 × 9 =
  8. 8.1234 × 9 + 5 =
  9. 9.Magic square (every row, column and diagonal has the same total): 7 17 ? | 21 13 5 | 11 9 19. What is the missing number?
  10. 10.Magic square (every row, column and diagonal has the same total): 14 29 26 | 35 23 ? | 20 17 32. What is the missing number?
  11. 11.297 + 792 =
  12. 12.What comes next? 9, 16, 23, 30, ? (a) 37 (b) 38 (c) 44 (d) 30
  13. 13.If today is Tuesday, what day was it 22 days ago? (a) Thursday (b) Monday (c) Tuesday (d) Sunday
  14. 14.3 × 9 =
  15. 15.Take 34 and take away the sum of its digits. What do you get?
  16. 16.A girl is 9 years old and her brother is 5 years older. How old will her brother be in 7 years?
  17. 17.30 × 4 =
  18. 18.Magic trick! Think of 8. Double it, add 10, halve it, then take away 8. What number do you get?
  19. 19.10 × 4 =
  20. 20.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
  21. 21.12 × 4 =
  22. 22.Think of 15. Multiply it by 2, then add 2. What number do you end with?
  23. 23.51 × 100 =
  24. 24.9 × 6 = ?4 — what is the missing digit?
  25. 25.19 × 4 =
  26. 26.The ages of two twins add up to 28. How old is each twin?
  27. 27.Magic trick! Think of 18. Double it, add 16, halve it, then take away 18. What number do you get?
  28. 28.?115 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.575? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.55 × 4 =
  31. 31.A girl is 11 years old and her brother is 3 years older. How old will her brother be in 5 years?
  32. 32.Double 26 =
  33. 33.434 × ? = 4340
  34. 34.28 × 4 =
  35. 35.6 × ? = 6000
  36. 36.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹19. How many ₹2 coins do you have?
  37. 37.8 × 4 =
  38. 38.9 × 4 =
  39. 39.A piggy bank has 3 coins of ₹5 and 2 coins of ₹2. How many rupees are in it?
  40. 40.Double 88 =

Answer key

  1. 52
  2. 88
  3. 104
  4. 444444444
  5. 1089
  6. 9
  7. 54
  8. 11111
  9. 15
  10. 11
  11. 1089
  12. 37
  13. Monday
  14. 27
  15. 27
  16. 21
  17. 120
  18. 5
  19. 40
  20. 2
  21. 48
  22. 32
  23. 5100
  24. 5
  25. 76
  26. 14
  27. 8
  28. 2
  29. 1
  30. 220
  31. 19
  32. 52
  33. 10
  34. 112
  35. 1000
  36. 6
  37. 32
  38. 36
  39. 19
  40. 176

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