1. Proportions

2. 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 Potatoes Dollars 8 1.603.00  Step 2: Multiply the diagonals.  Step 3: Solve by isolating the x.

3. 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 40 10020