Ratios
In the auditorium there are 21 red chairs and 29 blue chairs.
What is the ratio of the number of red chairs to the number of blue chairs?
21:29
What is the missing number?
5 7
10 14
15 21
? 28
25 35
20
Fill in the blank:
What is the new ratio when 5:2 becomes 1:__
2/5 or 1.5
Do the double number lines show the same or different ratio relationships?
4 12 16
7 21 28
8 16 24
3 6 9
Different
If you multiply one side of a ratio by 6, you also have to _____________
multiply the other side by 6
Your class has 2 students that are left handed compared to 10 students that are right handed
What is the ratio of the number of left handed students to all of the students?
2:12
What are the missing numbers?
2 5
8 ?
14 35
20 ?
2 5
8 20
14 35
20 50
Fill in the blank:
What is the new ratio when 3:6 becomes __:1
1/2 or 0/5
Do the double number lines show the same or different ratio relationships?
0 3 9 18
0 5 15 30
0 6 12 24
0 10 20 40
Same!
Ratios use which operations?
Multiplication and division
Trisha's Ice Cream Shop sold 8 sundaes with nuts and 3 sundaes with sprinkles.
What is the ratio of the number of sundaes with sprinkles to the number of sundaes with nuts?
3:8
A paint shade uses 11 cups of red paint for every 1 cup of blue paint.
11 ?
? 3
77 ?
11 1
33 3
77 7
Fill in the blank:
What is the new ratio when 3:2 becomes __:1
3/2 or 1.5
Which juice has a stronger flavor?
Juice A
water juice
4 2
8 4
12 6
Juice B
water juice
5 3
10 6
15 9
Juice B
True/False: When filling out a ratio table, I can always skip count.
False! You have to figure out what number the ratio is being multiplied by. You can NOT just skip count!
Every month, Brighton Obedience School passes 30 dogs for graduation for every 15 dogs that do not pass.
If 180 dogs pass for graduation, how many dogs do not pass?
90 dogs
A trail mix recipe calls for 5 cups of raisins for every 2 cups of nuts.
5 ?
? 8
40 ?
What is 69 and 56?
5 2
20 8
40 16
Jan and Alan each make chocolate milk. Jan uses 6 tablespoons of chocolate syrup for every 3 cups of milk. Alan uses 7 tablespoons of chocolate syrup for every 10 cups of milk.
In Alan's chocolate milk, there are _________ tablespoons of chocolate syrup for every 1 cup of milk.
7/10 or 0.7
Which paint is more red?
Paint A
red white
7 4
14 8
21 12
Paint B
red white
8 5
16 10
24 15
Paint A
The value of a ratio aka the unit ratio is when one side of the ratio is the number _______
1
For every lawn mowed, $4 are earned.
How much money is earned if 30 lawns are mowed?
$120
A punch recipe calls for 6 cups of lemonade for every 3 gallons of orange juice.
6 ?
? 9
36 ?
? 27
69 ?
6 3
18 9
36 18
54 27
69 34.5
Jan and Alan each make chocolate milk. Jan uses 6 tablespoons of chocolate syrup for every 3 cups of milk. Alan uses 7 tablespoons of chocolate syrup for every 10 cups of milk.
In Jan's chocolate milk, there are _________ tablespoons of chocolate syrup for every 1 cup of milk.
2
Trish and Adam each make chocolate milk. Trish uses 4 tablespoons of chocolate syrup for every 12 cups of milk. Adam uses 8 tablespoons of chocolate syrup for every 16 cups of milk.
Whose milk has the stronger chocolate flavor?
Adam!
When you graph two ratios with the same ratio relationship, their points will be on the (same / different) line.
Same