Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 798 · 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 87 and take away the sum of its digits. What do you get?
2. 2.8?67 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.Take 16 and take away the sum of its digits. What do you get?
4. 4.Take 20 and take away the sum of its digits. What do you get?
5. 5.Take 52 and take away the sum of its digits. What do you get?
6. 6.Take 98 and take away the sum of its digits. What do you get?
7. 7.?103 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.?530 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.85?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.?76 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.5?29 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.?073 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.Take 70 and take away the sum of its digits. What do you get?
14. 14.332? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.398? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.Take 99 and take away the sum of its digits. What do you get?
17. 17.Take 13 and take away the sum of its digits. What do you get?
18. 18.?840 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.5?83 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.?628 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.?00 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.Take 24 and take away the sum of its digits. What do you get?
23. 23.?001 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.7?13 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.?925 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.Take 48 and take away the sum of its digits. What do you get?
27. 27.?020 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.9?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.859? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.Take 60 and take away the sum of its digits. What do you get?
31. 31.Take 64 and take away the sum of its digits. What do you get?
32. 32.Take 39 and take away the sum of its digits. What do you get?
33. 33.Take 18 and take away the sum of its digits. What do you get?
34. 34.434? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.Take 53 and take away the sum of its digits. What do you get?
36. 36.Take 92 and take away the sum of its digits. What do you get?
37. 37.2?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.Take 78 and take away the sum of its digits. What do you get?
39. 39.?600 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.Take 84 and take away the sum of its digits. What do you get?

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