Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 254 · 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. 1.16 × ? = 16000
2. 2.A father is 45 years old and his son is 14. How old was the father when the son was born?
3. 3.I thought of a number, multiplied it by 4 and added 3. I got 47. What was my number?
4. 4.Magic square (every row, column and diagonal has the same total): 16 2 ? | 6 10 14 | 8 18 4. What is the missing number?
5. 5.Double 91 =
6. 6.9 × 1 =
7. 7.Half of 172 =
8. 8.9 × 2 = ?8 — what is the missing digit?
9. 9.1 + 2 + 3 + … + 19 =
10. 10.If today is Friday, what day was it 17 days ago? (a) Monday (b) Friday (c) Tuesday (d) Wednesday
11. 11.Odd one out: which number is NOT in the 5 times table? (a) 30 (b) 15 (c) 46 (d) 25
12. 12.52 × 4 =
13. 13.What comes next? 4, 8, 12, 16, ? (a) 16 (b) 20 (c) 21 (d) 24
14. 14.33 × 4 =
15. 15.Take 97 and take away the sum of its digits. What do you get?
16. 16.Take 634. Reverse its digits and take the smaller number away from the bigger one. What do you get?
17. 17.10 × ? = 10000
18. 18.792 + 297 =
19. 19.A piggy bank has 11 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
20. 20.A father is 36 years old and his son is 14. How old was the father when the son was born?
21. 21.12 × 1000 =
22. 22.Double 15 =
23. 23.Half of 142 =
24. 24.9 × 2 = 1? — what is the missing digit?
25. 25.If today is Monday, what day will it be after 94 days? (a) Sunday (b) Wednesday (c) Friday (d) Thursday
26. 26.If today is Saturday, what day will it be after 88 days? (a) Thursday (b) Wednesday (c) Tuesday (d) Saturday
27. 27.1 + 2 + 3 + … + 37 =
28. 28.9 × 10 = 9? — what is the missing digit?
29. 29.12345678 × 8 + 8 =
30. 30.123 × 8 + 3 =
31. 31.3 × 9 =
32. 32.8?86 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.A father is 32 years old and his son is 10. How old was the father when the son was born?
34. 34.1 + 2 + 3 + … + 26 =
35. 35.9 × 9 =
36. 36.Double 25 =
37. 37.Do the 1089 trick with 806: reverse and subtract, then reverse that answer and add. What do you get?
38. 38.Magic trick! Think of 9. Double it, add 8, halve it, then take away 9. What number do you get?
39. 39.1 + 2 + 3 + … + 20 =
40. 40.1 + 2 + 3 + … + 93 =

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