2. Addition and subtraction

Lesson

Do you feel that you have mastered addition problems, using some different methods?

Find the value of $270+520$270+520.

Just like addition, we can use place value blocks (also called base $10$10 models) to solve addition. See how we do this in this video.

We can also use place value columns to solve subtraction problems working down our page. In this video we look at subtracting a number in the thousands from another number in the thousands.

Use the number line to find the answer to $667-637$667−637.

First place $667$667 on the number line.

Place $637$637 on the number line.

Use the number line to work out the difference between $667$667 and $637$637.

Remember!

When we are subtracting down the page, it's really important to start from the right (units place) and work to the left, no matter how many digits our numbers have.

Apply place value to partition, rearrange and regroup numbers to at least tens of thousands to assist calculations and solve problems