2. Addition and subtraction

Lesson

Do you remember how we could solve addition problems using an algorithm?

Find the value of $41+56$41+56.

Let's see how place value models (also called Base 10 models) can help us with adding numbers together.

We can also use a number line to help with addition, so let's see how we solve the same problem, $321+243$321+243, using a number line this time.

Use the number line, to help you find the value of $19+343$19+343.

$19+343$19+343 $=$= $\editable{}$

This time we add some $4$4-digit numbers, using place value columns. We call this a vertical algorithm.

Find the value of $4400+403$4400+403.

Remember!

There are different ways to solve addition problems, and you can use them to add numbers of different sizes. It doesn't matter if your number has $3$3 digits, $4$4 digits, or even more!

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