Randy has 44 blocks. He uses some blocks to build a tower. If there are 38 blocks left How many blocks did he use to build the tower?
Randy has 44 blocks.
He uses some blocks to build a tower.

That means that the number of blocks he used to build the tower is less than 44.

If there are 38 blocks left, that means that the number of blocks he used to build the tower is 44 - 38, or 6.