Show two ways to decompose the number 749?

Two ways to decompose this number is:

749 = 700+40+9; and

749 = 100+649.

Explanation:

One method to decompose a number is to break it up by place value, into hundreds, tens and ones.

In this number, 7 is in the hundreds place; this makes 7 (100) = 700.

4 is in the tens place; 4 (10) = 40.

9 is in the ones place; 9 (1) = 9.

This makes 749 = 700+40+9.

Another method to decompose a number is to break it into pieces that can be added together.

For this number, I chose to start with 100. This means the second addend would be 749-100 = 649; this gives us

749 = 100+649.