Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 588 · 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.Half of 186 =
2. 2.7 × 9 =
3. 3.9 × 8 = ?2 — what is the missing digit?
4. 4.Magic trick! Think of 12. Double it, add 18, halve it, then take away 12. What number do you get?
5. 5.71?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.I thought of a number, added 6 and then doubled it. I got 32. What was my number?
7. 7.Magic trick! Think of 16. Double it, add 12, halve it, then take away 16. What number do you get?
8. 8.1 + 2 + 3 + … + 90 =
9. 9.39 × 100 =
10. 10.What comes next? 12, 20, 28, 36, ? (a) 45 (b) 52 (c) 36 (d) 44
11. 11.1 + 2 + 3 + … + 30 =
12. 12.1 + 2 + 3 + … + 22 =
13. 13.808 × ? = 8080
14. 14.Half of 178 =
15. 15.Magic trick! Think of 13. Double it, add 6, halve it, then take away 13. What number do you get?
16. 16.A piggy bank has 2 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
17. 17.57 × 4 =
18. 18.5 × 9 =
19. 19.9 × 10 = ?0 — what is the missing digit?
20. 20.Magic square (every row, column and diagonal has the same total): 22 8 18 | 12 16 ? | 14 24 10. What is the missing number?
21. 21.9 × 3 = 2? — what is the missing digit?
22. 22.17 × 4 =
23. 23.The 2nd of a month is a Monday. What day is the 18th of the same month? (a) Thursday (b) Saturday (c) Tuesday (d) Wednesday
24. 24.Double 13 =
25. 25.Magic square (every row, column and diagonal has the same total): 13 18 11 | 12 14 16 | 17 ? 15. What is the missing number?
26. 26.9 × 5 = 4? — what is the missing digit?
27. 27.50 × ? = 50000
28. 28.987 × 10 =
29. 29.740 × 10 =
30. 30.Do the 1089 trick with 630: reverse and subtract, then reverse that answer and add. What do you get?
31. 31.Take 218. Reverse its digits and take the smaller number away from the bigger one. What do you get?
32. 32.1 + 3 + 5 + … + 47 =
33. 33.Half of 192 =
34. 34.1 + 2 + 3 + … + 85 =
35. 35.9 × 7 = 6? — what is the missing digit?
36. 36.If today is Saturday, what day was it 28 days ago? (a) Friday (b) Saturday (c) Tuesday (d) Sunday
37. 37.1 + 2 + 3 + … + 33 =
38. 38.In 6 years a boy will be 20 years old. How old was he 5 years ago?
39. 39.The ages of two twins add up to 12. How old is each twin?
40. 40.?202 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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