Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 483 · 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. 1.28 × ? = 28000
2. 2.If today is Monday, what day was it 51 days ago? (a) Sunday (b) Saturday (c) Tuesday (d) Friday
3. 3.Magic trick! Think of 20. Double it, add 14, halve it, then take away 20. What number do you get?
4. 4.You have 10 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
5. 5.The 1st of a month is a Saturday. What day is the 30th of the same month? (a) Sunday (b) Wednesday (c) Monday (d) Saturday
6. 6.10 × 4 =
7. 7.7 × 9 =
8. 8.What comes next? 19, 24, 29, 34, ? (a) 39 (b) 34 (c) 44 (d) 40
9. 9.Half of 72 =
10. 10.9 × 7 = ?3 — what is the missing digit?
11. 11.Do the 1089 trick with 902: reverse and subtract, then reverse that answer and add. What do you get?
12. 12.Double 83 =
13. 13.Half of 162 =
14. 14.543 × 10 =
15. 15.A piggy bank has 11 coins of ₹5 and 11 coins of ₹2. How many rupees are in it?
16. 16.Magic square (every row, column and diagonal has the same total): ? 9 4 | 7 5 3 | 6 1 8. What is the missing number?
17. 17.If today is Saturday, what day was it 19 days ago? (a) Tuesday (b) Monday (c) Sunday (d) Thursday
18. 18.9 × 3 =
19. 19.Do the 1089 trick with 147: reverse and subtract, then reverse that answer and add. What do you get?
20. 20.Do the 1089 trick with 900: reverse and subtract, then reverse that answer and add. What do you get?
21. 21.123 × 8 + 3 =
22. 22.If today is Thursday, what day will it be after 35 days? (a) Thursday (b) Wednesday (c) Sunday (d) Friday
23. 23.37 × 4 =
24. 24.In 6 years a boy will be 14 years old. How old was he 4 years ago?
25. 25.47 × 4 =
26. 26.Take 78 and take away the sum of its digits. What do you get?
27. 27.9 × 9 =
28. 28.1 + 3 + 5 + … + 27 =
29. 29.9 × 3 = ?7 — what is the missing digit?
30. 30.52 × 4 =
31. 31.12345679 × 54 =
32. 32.9 × 5 = ?5 — what is the missing digit?
33. 33.1 + 2 + 3 + … + 31 =
34. 34.I thought of a number, added 2 and then doubled it. I got 42. What was my number?
35. 35.I thought of a number, multiplied it by 5 and added 7. I got 67. What was my number?
36. 36.What comes next? 4, 9, 16, 25, ? (a) 38 (b) 36 (c) 34 (d) 37
37. 37.A piggy bank has 2 coins of ₹5 and 4 coins of ₹2. How many rupees are in it?
38. 38.2 × 9 =
39. 39.8?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.111 × 111 =

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