Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 703 · 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. 1.198 + 891 =
2. 2.Take 23 and take away the sum of its digits. What do you get?
3. 3.499 × 10 =
4. 4.123 × 8 + 3 =
5. 5.Magic square (every row, column and diagonal has the same total): 9 14 7 | 8 10 ? | 13 6 11. What is the missing number?
6. 6.9 × 7 =
7. 7.9 × 2 = ?8 — what is the missing digit?
8. 8.37 × 27 =
9. 9.1234567 × 8 + 7 =
10. 10.What comes next? 8, 16, 24, 32, ? (a) 48 (b) 41 (c) 40 (d) 32
11. 11.10 × 9 =
12. 12.27 × 100 =
13. 13.9 × 8 =
14. 14.6 × 9 =
15. 15.Magic trick! Think of 6. Double it, add 4, halve it, then take away 6. What number do you get?
16. 16.39 × 100 =
17. 17.Take 900. Reverse its digits and take the smaller number away from the bigger one. What do you get?
18. 18.35 × 1000 =
19. 19.9 × 2 =
20. 20.1 + 3 + 5 + … + 23 =
21. 21.367 × 10 =
22. 22.5 × 9 =
23. 23.11?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.70 × 10 =
25. 25.Double 95 =
26. 26.Double 38 =
27. 27.A piggy bank has 12 coins of ₹5 and 11 coins of ₹2. How many rupees are in it?
28. 28.Magic square (every row, column and diagonal has the same total): 11 6 7 | 4 8 12 | 9 10 ?. What is the missing number?
29. 29.What comes next? 15, 17, 19, 21, ? (a) 25 (b) 21 (c) 24 (d) 23
30. 30.What comes next? 11, 17, 23, 29, ? (a) 41 (b) 35 (c) 36 (d) 29
31. 31.59 × 100 =
32. 32.A girl is 11 years old and her brother is 5 years older. How old will her brother be in 2 years?
33. 33.Do the 1089 trick with 377: reverse and subtract, then reverse that answer and add. What do you get?
34. 34.9 × 3 = 2? — what is the missing digit?
35. 35.18 × 4 =
36. 36.In 2 years a boy will be 10 years old. How old was he 3 years ago?
37. 37.Magic trick! Think of 19. Double it, add 16, halve it, then take away 19. What number do you get?
38. 38.If today is Saturday, what day was it 37 days ago? (a) Sunday (b) Thursday (c) Wednesday (d) Friday
39. 39.Odd one out: which number is NOT in the 4 times table? (a) 16 (b) 30 (c) 28 (d) 12
40. 40.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?

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