Im working a new quilt and its already not working out right. Can somebody tell me if Im doing something wrong????

I can't get past the first step so I'll tell you what it says step by step and you can tell me what Im doing wrong.

cutting the fabric

solid

18 squares 4 x 4

36 squares 4-3/8 x 4-3/8, cut in half diagonally to make half-spuare triangles

white-onwhite print

17 squares 7-1/2 x 7/1/2

36 squares 3-3/8 x-3/8

you have to cut strips too, which I have done but I can't get past the first step of sewing

step 1

stitch white half-square triangles to opposite sides of solid 4" square.

Heres the problem. My triangles are bigger than the squares. I cut them just like the directions said. At least I think I did. What did I do wrong???? Any ideas????

Judy