Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 514 · 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 62 =
2. 2.9 × 6 = ?4 — what is the missing digit?
3. 3.Magic trick! Think of 17. Double it, add 10, halve it, then take away 17. What number do you get?
4. 4.Double 21 =
5. 5.9 × 9 = ?1 — what is the missing digit?
6. 6.1 + 2 + 3 + … + 21 =
7. 7.48 × 4 =
8. 8.Do the 1089 trick with 327: reverse and subtract, then reverse that answer and add. What do you get?
9. 9.A piggy bank has 5 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
10. 10.Think of 7. Multiply it by 5, then add 5. What number do you end with?
11. 11.9 × 1 =
12. 12.Magic square (every row, column and diagonal has the same total): 19 ? 11 | 9 17 25 | 23 13 15. What is the missing number?
13. 13.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹14. How many ₹2 coins do you have?
14. 14.Magic trick! Think of 4. Double it, add 8, halve it, then take away 4. What number do you get?
15. 15.202 × 10 =
16. 16.57?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.What comes next? 1, 4, 9, 16, ? (a) 25 (b) 27 (c) 26 (d) 23
18. 18.Double 27 =
19. 19.12345679 × 45 =
20. 20.9 × 7 =
21. 21.1 + 2 + 3 + … + 88 =
22. 22.Magic square (every row, column and diagonal has the same total): ? 12 7 | 6 10 14 | 13 8 9. What is the missing number?
23. 23.198 + 891 =
24. 24.Double 92 =
25. 25.Magic trick! Think of 3. Double it, add 16, halve it, then take away 3. What number do you get?
26. 26.Take 11 and take away the sum of its digits. What do you get?
27. 27.52 × 4 =
28. 28.Magic square (every row, column and diagonal has the same total): 9 16 11 | ? 12 10 | 13 8 15. What is the missing number?
29. 29.Take 20 and take away the sum of its digits. What do you get?
30. 30.7 × 9 =
31. 31.If today is Monday, what day was it 57 days ago? (a) Wednesday (b) Saturday (c) Monday (d) Sunday
32. 32.49 × 4 =
33. 33.2 × 9 =
34. 34.1 + 2 + 3 + … + 86 =
35. 35.Do the 1089 trick with 290: reverse and subtract, then reverse that answer and add. What do you get?
36. 36.1 + 3 + 5 + … + 19 =
37. 37.A father is 44 years old and his son is 6. How old was the father when the son was born?
38. 38.53 × 4 =
39. 39.If today is Sunday, what day was it 42 days ago? (a) Monday (b) Sunday (c) Saturday (d) Wednesday
40. 40.Half of 144 =

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