Decide whether each statement is true or false

Decide whether each statement is true or false 2 ? 10 = 3 ? 20 = 18 6 3 ? 8 = 4 6 ? 24 = 24 When two fractions are equal we say: they are proportional We check the proportionality by using cross product (5 -4) Solving proportions

How many sugar packs do you think are inside a bottle of soda? Guess as close as you can Sugar Packs

There are 16 packs of sugar in one bottle of soda 16 packs = 48 grams of sugar How many packs of sugar are there in five bottles of soda? ? ? 16 packs 80 packs = 16 packs 240 grams of sugar

Obj: learn to work with proportions 1) In one bottle of soda there are 16 packs of sugar, at this rate How many packs of sugar are there is 12 bottles of soda? Step 1: Write the ratios 1 bottle of water 12 bottles of water 16 packs of sugar x packs of sugar Step 2: Set up the proportion “ A proportion is an equation of two equal ratios” 1 16 Step 3: Use cross product to solve for x 1 12 = x x = 16 12 x = 192 packs of sugar 576 grams of sugar

2) Tell whether the ratios Checking are proportional and 6 4 = 10 15 6 10 = 15 4 60 = 60 Yes 3) Alex is mixing raisins and nuts in a ratio 1: 4. If he mixes 5 kg of raisins with 15 kg of nuts, will the mixture be correct? Checking 1 5 = 15 4 1 15 = 4 5 15 = 20 No

4) The ratio of boys to girls in a soccer league is 4: 5. If there are 52 boys in the league, how many girls are there? Step 1: Write the ratios 4 boys 52 boys 5 girls x girls Step 2: Set up the proportion 4 52 = x 5 Step 3: Use cross product to solve for x 4 x =5 4 x = 260 4 x = 65 52

Class work Page 239 #s: 1, 3, 5, 7, & 15 Homework Page 239 #s: 2 – 16 even