Basic Facts

On the stage 7 basic facts I got 37 questions right and 13 questions wrong. I had to go down a stage. I did good on it. I got 48 questions right and 2 questions wrong. I went back up. I would've improve if I know the lowest common multiple and the prime factors. What I found easy was squaring, fraction, square rooting.  What I want to learn next is to find out the perimeter And the area of a triangle.