Unit 2 Review Find the GCF and LCM of 12 and 18. 6 12 18 2 - PowerPoint PPT Presentation

Unit 2 Review

Find the GCF and LCM of 12 and 18.

6 12 18 2 3 The GCF (12, 18) is 6. The LCM (12,18) is 6*2*3 = 36.

How many ⅓ inch line segments are in 4 inches?

4 ⅓ 4 * 3 12 line segments

What is the How do you know if numbers are reciprocals? reciprocal of ฀ ?

The reciprocal of ฀ is 6/5 (which is equal to 1 ฀ ). You know numbers are reciprocals when their product equals 1.

Janet is making 4 batches of cookies. Each batch requires ¾ cup of flour. How much flour does she need in total? draw a number line to model.

¾ * 4 = 3 cups of flour

⅔ cup of pasta is one serving. How many servings are in 6 cups?

6 ⅔ = 9 servings

There are 2 chocolate bars for every 3 lollipops. Emma has 9 lollipops. How many chocolate bars does she have?

chocolate 2 x lollipops 3 9 Emma has 6 chocolate bars.

Doug is making thank you gift bags for his friends. He has 12 pieces of gum and 20 Skittles to use. What is the largest number of bags he can make if he makes them all identical? How many pieces of gum would each bag have? how many skittles?

the gcf of 12 and 20 is 4, so doug can make 4 bags. Each would have 3 pieces of gum and 5 skittles.

there are 4 boys for every 3 girls on the bus. There are 21 kids on the bus in total. How many are girls?

there are 9 girls on the bus. To solve this, you can draw a tape diagram or write a proportion.

there are 12 cows and 8 chickens on the farm. what is the ratio of: ● cows to chickens ● chickens to cows ● chickens to total

● cows to chickens - 12:8 or 3:2 ● chickens to cows - 8:12 or 2:3 ● chickens to total - 8:20 or 2:5

Julie reads at a rate of 12 pages per hour. Complete the rate table below. 12 48 pages 1 2 5 8 hours

12 24 60 48 96 pages 1 2 5 4 8 hours

The A Train leaves every 10 minutes. The B Train leaves every 6 minutes. Both trains just left at 2:00. What is the next time they’ll both leave at the same time?

The LCM of 10 and 6 is 30, so both trains will leave again 30 minutes later, at 2:30.

Mr. jones has ¾ cup of fertilizer. he will use ⅛ cup scoop to pour all of the fertilizer onto his plants. how many times will mr. jones fill the measuring scoop with fertilizer?

3 1 4 8 3 * 8 = 6 4 Mr. jones will need to fill his scoop 6 times.