Math Test:Answering #4

4.The figure below is composed of seven congruent squares. The area is 43.75cm2. Calculate its perimeter.

A=Area
P=Perimeter

What We Know:
A=43.75cm2
7 congruent squares
P=14 congruent segments

Answer:
43.75cm2/7 =A of ONE square
                    =6.25cm2

square root of 6.25cm2=ONE side of small square
                                     =2.5cm

2.5cmx14=A of shape
                =35cm

Perimeter of the shape is 35cm.

Textbook page 68 #9

 

Question: Lori owed her mother $39. Lori paid back 1/3 of this debt and then paid back 1/4 of the remaining debt.
How Much does Lori still owe her mother?

$39 / 3=$13

$39 - $13=$26

$26 / 4=$3.25

$26 - $3.25=$22.75

Lori still owes her mother $22.75