Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 104 · 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. 1.1 + 2 + 3 + … + 98 =
2. 2.104 × 10 =
3. 3.Magic square (every row, column and diagonal has the same total): 9 7 17 | 19 11 3 | 5 15 ?. What is the missing number?
4. 4.15 × 4 =
5. 5.A piggy bank has 11 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?
6. 6.Take 204. Reverse its digits and take the smaller number away from the bigger one. What do you get?
7. 7.9 × 2 = 1? — what is the missing digit?
8. 8.9 × 6 = 5? — what is the missing digit?
9. 9.12345679 × 18 =
10. 10.Magic square (every row, column and diagonal has the same total): 10 5 6 | 3 7 11 | 8 ? 4. What is the missing number?
11. 11.Think of 8. Multiply it by 2, then add 7. What number do you end with?
12. 12.In 6 years a boy will be 15 years old. How old was he 2 years ago?
13. 13.Magic square (every row, column and diagonal has the same total): 12 ? 8 | 5 9 13 | 10 11 6. What is the missing number?
14. 14.Half of 152 =
15. 15.Do the 1089 trick with 703: reverse and subtract, then reverse that answer and add. What do you get?
16. 16.9 × 1 =
17. 17.9 × 5 = ?5 — what is the missing digit?
18. 18.66 × 100 =
19. 19.22 × 10 =
20. 20.9 × 5 =
21. 21.Magic square (every row, column and diagonal has the same total): 32 17 20 | 11 23 35 | 26 ? 14. What is the missing number?
22. 22.9 × 7 = ?3 — what is the missing digit?
23. 23.Do the 1089 trick with 910: reverse and subtract, then reverse that answer and add. What do you get?
24. 24.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
25. 25.Take 305. Reverse its digits and take the smaller number away from the bigger one. What do you get?
26. 26.I thought of a number, added 3 and then doubled it. I got 12. What was my number?
27. 27.I thought of a number, added 9 and then doubled it. I got 58. What was my number?
28. 28.Odd one out: which number is NOT in the 7 times table? (a) 25 (b) 21 (c) 35 (d) 42
29. 29.4 × 9 =
30. 30.9 × 6 =
31. 31.Do the 1089 trick with 701: reverse and subtract, then reverse that answer and add. What do you get?
32. 32.A girl is 12 years old and her brother is 5 years older. How old will her brother be in 9 years?
33. 33.I thought of a number, multiplied it by 4 and added 5. I got 61. What was my number?
34. 34.What comes next? 1, 2, 4, 8, ? (a) 17 (b) 12 (c) 16 (d) 14
35. 35.9 × 2 =
36. 36.43 × 4 =
37. 37.396 + 693 =
38. 38.1 + 3 + 5 + … + 19 =
39. 39.37 × 27 =
40. 40.65 × 10 =

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