Our goal in this section is to learn the method of subtraction through using base-10 number sense and the idea of “borrowing”.
We can write as sum of 1s, 10s,
100s, 1000s and so on. We just need to decide how many.
If we try to write , we can write However, we will prefer to keep remind ourselves how many copies of s and s we used too. So, we will put ZERO in their place and write it as follows:
In the following exercises, please, write the number as sum of base-10 blocks.
and