# How can I use base 10 blocks to subtract decimals?

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## How can I use base 10 blocks to subtract decimals?

Use base-10 blocks to model a starting number. Then subtract blocks from this number by dragging them into a subtraction bin. Blocks of equal value can be exchanged from one section of the mat to the other to help understand regrouping and borrowing.

How are base ten blocks useful when adding or subtracting numbers?

Base Ten Blocks are especially useful in providing students with ways to physically represent the concepts of place value and addition, subtraction, multiplication, and division of whole numbers. For each unit they place, they record the number corresponding to the total number of units placed (1, 2, 3…).

### What are the rules for adding and subtracting decimals?

TO ADD OR SUBTRACT DECIMALS: 1) Line up the decimal points vertically. Fill in any 0’s where necessary. 2) Add or subtract the numbers as if they were whole numbers. 3) Place the decimal point in the sum or difference so that it lines up vertically with the numbers being added or subtracted.

How do you teach adding and subtracting decimals?

1. Write down the numbers, one under the other, with the decimal points lined up.
2. Put in zeros so the numbers have the same length (see below for why that is OK)