A quilt is made up of 400 squares. each section is 16 squares long and 4 squares wide. there are 4 sections that are made of dotted red squares. the rest of the quilt is made of blue squares. how many blue squares are in the quilt?

First find the amount of red squares. there are 4 sections of red squares and 16 by 4 squares in each section. first find the number in each section by multiplying 16 squares long by 4 squares high 16*4=64 and that's for just one sections to find the total amount of red squares in all 4 sections we need to multiply 64 (the amount in one section) by the total amount of sections 4. resulting in 64*4=256 to find the blue squares used to fill the remainder of the quilt simply subtract the total red squares by the total squares like this 400-256=144, 144 is the amount of blue squares.