Lesson 1.1, Part 2
In Part One I talked about what Digit Sums were, and why they are useful. Now I’ll show you some examples where I compute Digit Sums.
Example: 27
27 —-> (2 + 7) —-> 9
Therefore the Digit Sum of 27 is 9.
Example: 435
435 —-> (4 + 3 + 5) —-> 12
Since ’12′ contains two digits, and were trying to get down to one…we add them again.
12 —-> (1 + 2) —-> 3. Therefore the Digit Sum of 435 is 3.
Note: Notice that I didn’t use an ‘=’ sign because 435 does not equal 3, only the Digit Sum does.
Example: 102372
102372 —-> (1 + 0 + 2 + 3 + 7 + 2) —-> 15
15 —-> (1 + 5) —-> 6.
Therefore the Digit Sum of 102372 is 6.
Try to solve the problems below on your own first, whether mentally or by writing it down, before clicking on the link to the solutions.
PRACTICE PROBLEMS
1. 29
2. 32
3. 57
4. 354
5. 271
6. 10253
7. 27361
8. 56381
9. 1029301
10. 1425361
Answers to Practice Problems.
Other Parts of Lesson 1.1:
Part One – What are Digit Sums?
Part Three – The Nine-Point Circle
Part Four – Casting Out the 9′s
[...] on August 7, 2008 at 4:20 pm1 Computing Digit Sums « Knowledge & Wisdom [...]
[...] Parts of Lesson 1.1: Part One – What are Digit Sums? Part Two – Computing Digit Sums Part Four – Casting Out the [...]
[...] 9, 2008 by Liberius In Part 2, we discussed how to compute Digit Sums. If you did the practice problems (I hope you all did!), [...]