Elizabeth is making a road with red blocks and blue blocks. She needs 52 blocks altogether. Which group of red and blue blocks will make 52?
We can add together the red blocks and the blue blocks in each column to find out
which group of blocks together will make 52. 30 is three tens and no ones. 22 is two tens and two ones.
Let’s start by adding the ones. Zero plus two makes two. Let’s add the tens. Three plus two is five. So this is the group of red and blue blocks which together will make 52. The answer is 30 plus 22.