Add and Subtract Two Decimal Place Numbers KS3 Revision
What you need to know
Things to remember:
- We can split up our numbers into “whole number” and “decimal parts”, adding and subtracting separately.
- Adding a negative is the same as subtracting.
We can add and subtract decimals in two ways.
Method 1: Column addition and subtraction
Just like whole numbers, we can add and subtract decimals, we just need to remember to put in the decimal point.
What is the value of 2.64+4.38
When adding using column addition, we do it in the exact same way, carrying 1 when the decimal value goes above 10.
What is the value of 9.23-2.35
Remember, when we subtract a bigger number from a smaller number, we “borrow” 1 from the place value to the left.
Question 1: What is the value of 6.23+5.48?
Question 2: What is the value of 9.35-3.16