Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 619 · 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. 1.12345679 × 9 =
2. 2.9 × 6 = ?4 — what is the missing digit?
3. 3.Magic square (every row, column and diagonal has the same total): 8 3 4 | 1 5 9 | 6 ? 2. What is the missing number?
4. 4.9 × 8 = 7? — what is the missing digit?
5. 5.9 × 4 = ?6 — what is the missing digit?
6. 6.What comes next? 17, 22, 27, 32, ? (a) 32 (b) 42 (c) 37 (d) 38
7. 7.Magic square (every row, column and diagonal has the same total): 5 10 ? | 12 8 4 | 7 6 11. What is the missing number?
8. 8.What comes next? 12, 21, 30, 39, ? (a) 39 (b) 57 (c) 48 (d) 49
9. 9.Do the 1089 trick with 936: reverse and subtract, then reverse that answer and add. What do you get?
10. 10.9 × 3 =
11. 11.A girl is 8 years old and her brother is 5 years older. How old will her brother be in 7 years?
12. 12.Magic trick! Think of 10. Double it, add 6, halve it, then take away 10. What number do you get?
13. 13.Half of 72 =
14. 14.Think of 3. Multiply it by 2, then add 4. What number do you end with?
15. 15.If today is Friday, what day will it be after 19 days? (a) Tuesday (b) Thursday (c) Wednesday (d) Saturday
16. 16.Do the 1089 trick with 770: reverse and subtract, then reverse that answer and add. What do you get?
17. 17.Take 508. Reverse its digits and take the smaller number away from the bigger one. What do you get?
18. 18.1 + 2 + 3 + … + 63 =
19. 19.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 48 (c) 49 (d) 42
20. 20.If today is Friday, what day will it be after 60 days? (a) Friday (b) Wednesday (c) Monday (d) Tuesday
21. 21.Odd one out: which number is NOT in the 7 times table? (a) 50 (b) 28 (c) 42 (d) 35
22. 22.29 × 4 =
23. 23.Half of 112 =
24. 24.10 × 1000 =
25. 25.Take 63 and take away the sum of its digits. What do you get?
26. 26.Double 13 =
27. 27.1234 × 9 + 5 =
28. 28.A piggy bank has 11 coins of ₹5 and 10 coins of ₹2. How many rupees are in it?
29. 29.1 + 2 + 3 + … + 11 =
30. 30.36 × 1000 =
31. 31.What comes next? 9, 17, 25, 33, ? (a) 42 (b) 41 (c) 33 (d) 49
32. 32.11 × 11 =
33. 33.Think of 14. Multiply it by 2, then add 8. What number do you end with?
34. 34.Take 780. Reverse its digits and take the smaller number away from the bigger one. What do you get?
35. 35.1 + 2 + 3 + … + 53 =
36. 36.What comes next? 13, 21, 29, 37, ? (a) 53 (b) 37 (c) 46 (d) 45
37. 37.8 × 9 =
38. 38.12345679 × 27 =
39. 39.15 × 4 =
40. 40.13 × 4 =

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