Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 317 · 40 questions

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.

1. 1.17 × 4 =
2. 2.The 4th of a month is a Thursday. What day is the 15th of the same month? (a) Thursday (b) Sunday (c) Monday (d) Tuesday
3. 3.Take 881. Reverse its digits and take the smaller number away from the bigger one. What do you get?
4. 4.A father is 45 years old and his son is 12. How old was the father when the son was born?
5. 5.A father is 33 years old and his son is 14. How old was the father when the son was born?
6. 6.Magic square (every row, column and diagonal has the same total): ? 5 10 | 11 7 3 | 4 9 8. What is the missing number?
7. 7.Think of 11. Multiply it by 3, then add 3. What number do you end with?
8. 8.26 × 4 =
9. 9.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
10. 10.9 × 2 = 1? — what is the missing digit?
11. 11.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹24. How many ₹2 coins do you have?
12. 12.5 × 9 =
13. 13.A father is 34 years old and his son is 9. How old was the father when the son was born?
14. 14.The ages of two twins add up to 18. How old is each twin?
15. 15.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
16. 16.Odd one out: which number is NOT in the 8 times table? (a) 24 (b) 40 (c) 64 (d) 31
17. 17.Magic trick! Think of 12. Double it, add 8, halve it, then take away 12. What number do you get?
18. 18.Magic square (every row, column and diagonal has the same total): 3 8 7 | 10 6 ? | 5 4 9. What is the missing number?
19. 19.Odd one out: which number is NOT in the 8 times table? (a) 40 (b) 56 (c) 16 (d) 30
20. 20.A girl is 10 years old and her brother is 4 years older. How old will her brother be in 8 years?
21. 21.The ages of two twins add up to 22. How old is each twin?
22. 22.1234567 × 9 + 8 =
23. 23.12 × 9 + 3 =
24. 24.1 + 2 + 3 + … + 35 =
25. 25.Think of 3. Multiply it by 4, then add 1. What number do you end with?
26. 26.Magic square (every row, column and diagonal has the same total): 24 ? 16 | 10 18 26 | 20 22 12. What is the missing number?
27. 27.9 × 3 = ?7 — what is the missing digit?
28. 28.19 × 4 =
29. 29.Magic trick! Think of 20. Double it, add 12, halve it, then take away 20. What number do you get?
30. 30.A father is 36 years old and his son is 13. How old was the father when the son was born?
31. 31.Magic trick! Think of 4. Double it, add 8, halve it, then take away 4. What number do you get?
32. 32.1 + 3 + 5 + … + 41 =
33. 33.12345678 × 9 + 9 =
34. 34.1 + 3 + 5 + … + 35 =
35. 35.49 × 4 =
36. 36.The 4th of a month is a Friday. What day is the 14th of the same month? (a) Thursday (b) Tuesday (c) Monday (d) Sunday
37. 37.Take 679. Reverse its digits and take the smaller number away from the bigger one. What do you get?
38. 38.9 × 8 = ?2 — what is the missing digit?
39. 39.Magic square (every row, column and diagonal has the same total): 12 11 16 | 17 13 9 | 10 ? 14. What is the missing number?
40. 40.If today is Wednesday, what day will it be after 18 days? (a) Monday (b) Wednesday (c) Saturday (d) Sunday

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