January 2014
Beginner
288 pages
4h 31m
English
CHAPTER5
Checking Your Answers with Digit Sums
In This Chapter
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In previous chapters, you learned speedier ways to solve addition, subtraction, multiplication, and division problems. But how do you know if they’re right?
In this chapter, I talk about the concept of digit sums, which can help you check your calculations in a simple—not to mention quick—manner.
What Are Digit Sums?
The word digit means numbers like 1, 2, ...