Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 253 · 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.I thought of a number, added 7 and then doubled it. I got 26. What was my number?
2. 2.Magic trick! Think of 16. Double it, add 10, halve it, then take away 16. What number do you get?
3. 3.10 × 9 =
4. 4.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹17. How many ₹2 coins do you have?
5. 5.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹25. How many ₹2 coins do you have?
6. 6.Magic trick! Think of 2. Double it, add 8, halve it, then take away 2. What number do you get?
7. 7.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
8. 8.9 × 1 =
9. 9.12345679 × 81 =
10. 10.Double 97 =
11. 11.9 × 2 =
12. 12.If today is Saturday, what day was it 26 days ago? (a) Monday (b) Thursday (c) Tuesday (d) Sunday
13. 13.1 + 2 + 3 + … + 35 =
14. 14.Magic square (every row, column and diagonal has the same total): 16 2 12 | 6 10 14 | 8 ? 4. What is the missing number?
15. 15.162 × 10 =
16. 16.19 × 4 =
17. 17.6 × 9 =
18. 18.214? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.29 × ? = 2900
20. 20.Magic square (every row, column and diagonal has the same total): ? 18 16 | 22 14 6 | 12 10 20. What is the missing number?
21. 21.32 × 100 =
22. 22.Take 114. Reverse its digits and take the smaller number away from the bigger one. What do you get?
23. 23.2 × 9 =
24. 24.A girl is 11 years old and her brother is 4 years older. How old will her brother be in 5 years?
25. 25.693 + 396 =
26. 26.I thought of a number, added 1 and then doubled it. I got 8. What was my number?
27. 27.1 + 2 + 3 + … + 43 =
28. 28.9 × 9 =
29. 29.A girl is 12 years old and her brother is 3 years older. How old will her brother be in 2 years?
30. 30.What comes next? 4, 9, 16, 25, ? (a) 34 (b) 37 (c) 38 (d) 36
31. 31.12345679 × 18 =
32. 32.3 × 9 =
33. 33.Take 98 and take away the sum of its digits. What do you get?
34. 34.792 + 297 =
35. 35.Double 61 =
36. 36.If today is Saturday, what day was it 12 days ago? (a) Tuesday (b) Monday (c) Thursday (d) Sunday
37. 37.12345 × 9 + 6 =
38. 38.Double 21 =
39. 39.Do the 1089 trick with 980: reverse and subtract, then reverse that answer and add. What do you get?
40. 40.In 4 years a boy will be 13 years old. How old was he 7 years ago?

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