# Question: Prerequisites When Adding And Subtracting Decimals Lesson Plan?

## 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)

## What do you always need to do before adding or subtracting decimal?

When asked to add or subtract decimals, the most important step is to line up the decimal points. Step 1: Line up the decimal points so that similar place values are lined up. In other words, the tens place in both numbers should be lined up, the ones place in both numbers should be lined up, etc.

## Why do students need to know how do you add and subtract decimals?

Lining up the decimal points helps us line up the place values so that place values are added with or subtracted from ‘like’ place values. If students don’t understand the point of lining up the decimal points when adding and subtracting decimals, then somehow they’ve missed the idea of place value.

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## How do you teach subtracting decimals?

To subtract decimals, follow these steps:

1. Write down the two numbers, one under the other, with the decimal points lined up.
2. Add zeros so the numbers have the same length.
3. Then subtract normally, remembering to put the decimal point in the answer.

## What are the four rules of decimals?

You should become efficient in using the four basic operations involving decimals— addition, subtraction, multiplication, and division.

## What is the rule for adding and subtracting fractions?

To add or subtract fractions they must have the same denominator (the bottom value). If the denominators are already the same then it is just a matter of either adding or subtracting the numerators (the top value). If the denominators are different then a common denominator needs to be found.

## How do you add and subtract decimals with different cases?

Steps to add or subtract Decimals: Write the decimals one below the other as per the places of the digits. Add or subtract starting from the rightmost digit and moving towards the leftmost digit. Place the decimal point under the decimal point in the answer.

Take adding decimals. This is typically part of grade 5 math instruction.