Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 938 · 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.Take 970. Reverse its digits and take the smaller number away from the bigger one. What do you get?
2. 2.The ages of two twins add up to 18. How old is each twin?
3. 3.1 + 3 + 5 + … + 27 =
4. 4.1 + 3 + 5 + … + 33 =
5. 5.9 × 4 =
6. 6.1 + 2 + 3 + … + 51 =
7. 7.Half of 102 =
8. 8.12345679 × 63 =
9. 9.9 × 7 = ?3 — what is the missing digit?
10. 10.Odd one out: which number is NOT in the 6 times table? (a) 54 (b) 41 (c) 42 (d) 24
11. 11.1 + 3 + 5 + … + 23 =
12. 12.Half of 52 =
13. 13.A girl is 5 years old and her brother is 3 years older. How old will her brother be in 4 years?
14. 14.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 80 (c) 60 (d) 70
15. 15.8?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.Take 408. Reverse its digits and take the smaller number away from the bigger one. What do you get?
17. 17.Do the 1089 trick with 329: reverse and subtract, then reverse that answer and add. What do you get?
18. 18.842 × ? = 8420
19. 19.Double 69 =
20. 20.1 + 2 + 3 + … + 36 =
21. 21.?182 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.If today is Monday, what day will it be after 33 days? (a) Friday (b) Sunday (c) Saturday (d) Tuesday
23. 23.In 5 years a boy will be 17 years old. How old was he 5 years ago?
24. 24.9 × 10 = 9? — what is the missing digit?
25. 25.Take 844. Reverse its digits and take the smaller number away from the bigger one. What do you get?
26. 26.Magic square (every row, column and diagonal has the same total): ? 10 20 | 22 14 6 | 8 18 16. What is the missing number?
27. 27.54 × 4 =
28. 28.4 × 9 =
29. 29.1 + 2 + 3 + … + 39 =
30. 30.45 × 4 =
31. 31.Take 84 and take away the sum of its digits. What do you get?
32. 32.58 × 4 =
33. 33.20 × 4 =
34. 34.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
35. 35.8 × 4 =
36. 36.Take 92 and take away the sum of its digits. What do you get?
37. 37.9 × 9 = 8? — what is the missing digit?
38. 38.724 × ? = 7240
39. 39.A piggy bank has 4 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?
40. 40.Double 42 =

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