Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 513 · 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. 1.9 × 5 = 4? — what is the missing digit?
2. 2.9 × 4 =
3. 3.Magic trick! Think of 5. Double it, add 6, halve it, then take away 5. What number do you get?
4. 4.9 × 6 = 5? — what is the missing digit?
5. 5.Do the 1089 trick with 820: reverse and subtract, then reverse that answer and add. What do you get?
6. 6.9 × 10 =
7. 7.The 7th of a month is a Friday. What day is the 22nd of the same month? (a) Sunday (b) Friday (c) Tuesday (d) Saturday
8. 8.55 × 4 =
9. 9.2 × 9 =
10. 10.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
11. 11.I thought of a number, multiplied it by 3 and added 5. I got 50. What was my number?
12. 12.A father is 30 years old and his son is 4. How old was the father when the son was born?
13. 13.1 + 2 + 3 + … + 92 =
14. 14.?870 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.Take 49 and take away the sum of its digits. What do you get?
16. 16.Magic trick! Think of 9. Double it, add 18, halve it, then take away 9. What number do you get?
17. 17.192 × 10 =
18. 18.601 × ? = 6010
19. 19.12345679 × 72 =
20. 20.12 × ? = 1200
21. 21.A piggy bank has 4 coins of ₹5 and 11 coins of ₹2. How many rupees are in it?
22. 22.9 × 5 = ?5 — what is the missing digit?
23. 23.What comes next? 4, 8, 16, 32, ? (a) 56 (b) 48 (c) 65 (d) 64
24. 24.The 8th of a month is a Friday. What day is the 26th of the same month? (a) Wednesday (b) Monday (c) Tuesday (d) Friday
25. 25.95? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.A father is 39 years old and his son is 13. How old was the father when the son was born?
27. 27.3 × 9 =
28. 28.Magic square (every row, column and diagonal has the same total): 16 ? 12 | 9 13 17 | 14 15 10. What is the missing number?
29. 29.12 × 4 =
30. 30.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
31. 31.142 × ? = 1420
32. 32.9 × 4 = 3? — what is the missing digit?
33. 33.37 × 12 =
34. 34.1 + 2 + 3 + … + 15 =
35. 35.Double 74 =
36. 36.Take 98 and take away the sum of its digits. What do you get?
37. 37.1 + 2 + 3 + … + 60 =
38. 38.16 × ? = 1600
39. 39.Magic square (every row, column and diagonal has the same total): 24 3 ? | 9 15 21 | 12 27 6. What is the missing number?
40. 40.If today is Monday, what day will it be after 59 days? (a) Friday (b) Sunday (c) Thursday (d) Wednesday

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