Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 268 · 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.?268 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.Take 82 and take away the sum of its digits. What do you get?
3. 3.4?25 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.38? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.Take 87 and take away the sum of its digits. What do you get?
6. 6.Take 57 and take away the sum of its digits. What do you get?
7. 7.?09 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.54?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.Take 67 and take away the sum of its digits. What do you get?
10. 10.601? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.?84 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.Take 28 and take away the sum of its digits. What do you get?
13. 13.Take 29 and take away the sum of its digits. What do you get?
14. 14.Take 48 and take away the sum of its digits. What do you get?
15. 15.Take 34 and take away the sum of its digits. What do you get?
16. 16.7?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.Take 96 and take away the sum of its digits. What do you get?
18. 18.Take 55 and take away the sum of its digits. What do you get?
19. 19.5?29 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.?100 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.?125 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.Take 90 and take away the sum of its digits. What do you get?
23. 23.?053 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.Take 93 and take away the sum of its digits. What do you get?
25. 25.7?43 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.Take 69 and take away the sum of its digits. What do you get?
27. 27.Take 24 and take away the sum of its digits. What do you get?
28. 28.308? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.5?75 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.?804 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.?601 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.?564 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.540? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.Take 20 and take away the sum of its digits. What do you get?
35. 35.Take 21 and take away the sum of its digits. What do you get?
36. 36.38?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.?872 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.Take 66 and take away the sum of its digits. What do you get?
39. 39.60?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.Take 86 and take away the sum of its digits. What do you get?

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