Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 756 · 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. 1.37 × 18 =
2. 2.1 + 3 + 5 + … + 23 =
3. 3.5 × 9 =
4. 4.8?17 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.9 × 2 =
6. 6.If today is Saturday, what day will it be after 16 days? (a) Thursday (b) Tuesday (c) Monday (d) Sunday
7. 7.If today is Wednesday, what day will it be after 72 days? (a) Saturday (b) Friday (c) Monday (d) Thursday
8. 8.I thought of a number, multiplied it by 4 and added 3. I got 23. What was my number?
9. 9.123 × 9 + 4 =
10. 10.11111 × 11111 =
11. 11.44 × 4 =
12. 12.45 × 4 =
13. 13.What comes next? 5, 10, 20, 40, ? (a) 80 (b) 60 (c) 70 (d) 81
14. 14.1 + 2 + 3 + … + 28 =
15. 15.Take 76 and take away the sum of its digits. What do you get?
16. 16.8 × 9 =
17. 17.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
18. 18.9 × 10 = ?0 — what is the missing digit?
19. 19.Take 23 and take away the sum of its digits. What do you get?
20. 20.356 × 10 =
21. 21.You have 10 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
22. 22.1 + 3 + 5 + … + 11 =
23. 23.28 × 4 =
24. 24.Take 426. Reverse its digits and take the smaller number away from the bigger one. What do you get?
25. 25.A piggy bank has 6 coins of ₹5 and 8 coins of ₹2. How many rupees are in it?
26. 26.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 17 (c) 14 (d) 16
27. 27.Magic square (every row, column and diagonal has the same total): 9 7 17 | 19 11 3 | 5 ? 13. What is the missing number?
28. 28.12345679 × 63 =
29. 29.Magic square (every row, column and diagonal has the same total): 9 16 11 | 14 12 10 | 13 ? 15. What is the missing number?
30. 30.Magic square (every row, column and diagonal has the same total): 9 23 13 | 19 ? 11 | 17 7 21. What is the missing number?
31. 31.792 + 297 =
32. 32.74?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.58 × 4 =
34. 34.A girl is 10 years old and her brother is 6 years older. How old will her brother be in 2 years?
35. 35.61 × ? = 6100
36. 36.6 × ? = 6000
37. 37.100 × ? = 1000
38. 38.9 × 10 = 9? — what is the missing digit?
39. 39.Odd one out: which number is NOT in the 4 times table? (a) 12 (b) 20 (c) 8 (d) 34
40. 40.A piggy bank has 11 coins of ₹5 and 6 coins of ₹2. How many rupees are in it?

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