Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 59 · 40 questions

The trick (Digits add to the 9 table): Add the digits you can see. Find the next number in the 9 table (9, 18, 27 …) above that total. The hidden digit is the difference. (Any number minus its digit sum is in the 9 table too.)

1. 1.Take 41 and take away the sum of its digits. What do you get?
2. 2.?871 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.Take 31 and take away the sum of its digits. What do you get?
4. 4.?344 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.7?39 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.276? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.?953 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.Take 96 and take away the sum of its digits. What do you get?
9. 9.Take 79 and take away the sum of its digits. What do you get?
10. 10.8?37 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.Take 67 and take away the sum of its digits. What do you get?
12. 12.71?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.2?32 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.Take 90 and take away the sum of its digits. What do you get?
15. 15.51?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.Take 32 and take away the sum of its digits. What do you get?
17. 17.Take 19 and take away the sum of its digits. What do you get?
18. 18.5?10 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.Take 66 and take away the sum of its digits. What do you get?
20. 20.Take 43 and take away the sum of its digits. What do you get?
21. 21.Take 50 and take away the sum of its digits. What do you get?
22. 22.1?52 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.Take 39 and take away the sum of its digits. What do you get?
24. 24.63?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.76?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.Take 85 and take away the sum of its digits. What do you get?
27. 27.Take 15 and take away the sum of its digits. What do you get?
28. 28.819? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.505? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.Take 14 and take away the sum of its digits. What do you get?
31. 31.Take 42 and take away the sum of its digits. What do you get?
32. 32.233? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.44? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.67?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.?947 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.Take 70 and take away the sum of its digits. What do you get?
37. 37.578? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.436? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.104? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.Take 40 and take away the sum of its digits. What do you get?

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