# Rewriting addition as plus 10 minus

Let's do another example, and this is going to be one like the type of exercise that you might see on Khan Academy.

And now we can actually subtract.

Why don't we take 10 from here, and we'll be left with 60, and give that 10 to the ones place. So here I'm adding 50 plus 3 first.

Now, why was that useful? And minus is So it's going to be 50 plus So we have one more step to finish the problem. That's 53 right?

## Adding negative numbers

Then we simplify if the answer is not in normalized form. One and two-digit numbers are used in the number sentences. Distributive Property of Multiplication over Addition The distributive property of multiplication over addition can be used when you multiply a number by a sum. Let me expand it out. On the left side, we add 10 and 2, and then multiply by 3. Let's do another example, and this is going to be one like the type of exercise that you might see on Khan Academy. Well, three plus , that's just The same process works if the 3 is on the other side of the parentheses, as in the example below.

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