Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 319 · 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. 1.57 × 4 =
2. 2.Magic square (every row, column and diagonal has the same total): 11 25 15 | 21 17 13 | ? 9 23. What is the missing number?
3. 3.1 + 3 + 5 + … + 37 =
4. 4.Take 92 and take away the sum of its digits. What do you get?
5. 5.Magic square (every row, column and diagonal has the same total): 8 18 16 | 22 ? 6 | 12 10 20. What is the missing number?
6. 6.Magic square (every row, column and diagonal has the same total): 13 28 7 | 10 16 22 | 25 ? 19. What is the missing number?
7. 7.19 × 4 =
8. 8.The ages of two twins add up to 8. How old is each twin?
9. 9.9 × 7 =
10. 10.297 + 792 =
11. 11.1 × 9 =
12. 12.Think of 13. Multiply it by 4, then add 8. What number do you end with?
13. 13.If today is Monday, what day was it 46 days ago? (a) Thursday (b) Friday (c) Sunday (d) Wednesday
14. 14.Think of 9. Multiply it by 5, then add 4. What number do you end with?
15. 15.12 × 4 =
16. 16.22 × 4 =
17. 17.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 17 (c) 12 (d) 16
18. 18.?577 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
20. 20.Magic square (every row, column and diagonal has the same total): ? 10 5 | 4 8 12 | 11 6 7. What is the missing number?
21. 21.87 × ? = 8700
22. 22.9 × 5 =
23. 23.66 × 100 =
24. 24.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
25. 25.9 × 2 =
26. 26.495 + 594 =
27. 27.19 × 100 =
28. 28.I thought of a number, added 3 and then doubled it. I got 20. What was my number?
29. 29.8 × 9 =
30. 30.I thought of a number, added 8 and then doubled it. I got 28. What was my number?
31. 31.37 × 3 =
32. 32.6 × ? = 6000
33. 33.1 + 2 + 3 + … + 35 =
34. 34.What comes next? 10, 19, 28, 37, ? (a) 55 (b) 46 (c) 37 (d) 47
35. 35.Double 76 =
36. 36.A piggy bank has 7 coins of ₹5 and 11 coins of ₹2. How many rupees are in it?
37. 37.Magic trick! Think of 20. Double it, add 12, halve it, then take away 20. What number do you get?
38. 38.If today is Wednesday, what day will it be after 62 days? (a) Friday (b) Monday (c) Wednesday (d) Tuesday
39. 39.9 × 8 = ?2 — what is the missing digit?
40. 40.Magic square (every row, column and diagonal has the same total): 15 36 21 | 30 24 18 | ? 12 33. What is the missing number?

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