Are you ready?
In previous lessons, we have looked at how to add and subtract decimals with up to 2 decimal places. We'll apply the same strategies when adding bigger decimals, so let's start with a bit of review
Examples
Example 1
Find 13.74+37.26 giving your answer as a decimal.
Example 2
Find 53.29-42.29, giving your answer as a decimal.
When we add and subtract numbers with decimals, the process is exactly the same as when we work with whole numbers. We always start from the far right place value position, and move left, regrouping if we need to.
Add numbers with three decimal places
In this video, we work through an example of adding two numbers with 3 decimal places.
In this video, we use an example of adding two numbers with 3 decimal places where we need to rename some decimals, after regrouping.
Examples
Example 3
Find 563.362 + 331.495, writing your answer in decimal form.
We can use a vertical algorithm to add decimals up to thousandths.
Subtract decimals to thousandths
This video works through subtracting large numbers with decimals in the thousandths.
Examples
Example 4
Find 96.689 - 83.413, writing your answer in decimal form.
We can use a vertical algorithm to subtract decimals up to thousandths.