Proportionsby Ms. Johnson

Marshall bought 8 potatoes for $1.60. How many potatoes could he buy for $3.00?

Step 1: Label the proportion with the items you are comparing, and fill in the numbers.

x

8 * 3.00 = 1.60x

24 = 1.6x

15 = x

/1.6/1.6

Potatoes

Dollars

8

1.60 3.00

Step 2: Multiply the diagonals.

Step 3: Solve by isolating the x.

What is 40% of 20?

Step 1: Write the percent over 100. Write the number by “is” in the numerator, and the number by “of” in the denominator.

Step 2: Multiply the diagonals.

Step 3: Solve by isolating the x.

x

40 * 20 = 100x

800 = 100x

8 = x

/100/100

40

100 20

Unit Reflection

I liked the proportions word problems that related to shopping.

I didn’t like the problems that involved decimals.

The hardest part was solving percent problems when I didn’t see an “is” or “of” in the problem.

The easiest part was solving the proportions after I wrote them. I learned how to do that in elementary school.