The length of the rectangle is 10 dm, the area is 80 dm. Find its width.

given a rectangle
rectangle length = 10 dm
rectangle area = 80 dm
find width
decision
the area of the rectangle is found by the formula
area dm squared = width * length, then
80 dm squared = width * 10 dm
width * 10 dm = 80 dm 2
width = 80 dm2 / 10 dm
width = 80 dm / 10
width 80/10 dm
width = 8 * 10/10 dm
we reduce the numerator and denominator on the left side of the expression by 10, then it will remain
width = 8 * 1/1 dm
width = 8/1 dm
width = 8 dm
answer: 8 dm