Ratios Day 1
Presentation Problems
1. In Mr. Romero’s auto shop class, the ratio of boys to girls is 5:2. If there are 35
students in the class, how many are boys?
Boys
5
5
5
5
5
= ? (25)
= 35
Girls
5
5
7 units = 35
35 ÷ 7 = 5
1 unit = 5
5 units of 5
5 • 5 = 25
In Mr. Romero’s class, there are 25 boys.
Milk It!? How many more boys are there than girls?
2. The Great Zucchini, an illusionist, has black rabbits and white rabbits which he pulls
from his hat. The ratio of black rabbits to white rabbits is 1:3. If the Great Zucchini has
52 rabbits, how many of them are white?
Black rabbits
13
= 52
White rabbits
13
13
13
= ? (39)
4 units = 52
52 ÷ 4 = 13
1 unit = 13
3 units of 13
3 • 13 = 39
The Great Zucchini has 39 white rabbits.
Milk It! How many more white rabbits than black rabbits does he have?
3. Micah has a bag of 55 marbles, all blue and red. If the ratio of red to blue marbles
is 3:2, how many red marbles does Micah have? How many blue marbles does he
have?
Blue marbles
11
11
5 units = 55
= ? (22)
= 55
Red marbles
11
11
11
= ? (33)
55 ÷ 5 = 11
1 unit = 11
3 units of 11
3 • 11 = 33
Micah has 33 red marbles and 22 blue marbles.
Milk It! What percent of the marbles are red?
2 units of 11
2 • 11 = 22
Ratios Day 1
Assessment Problems
1. Rachel drinks 128 ounces of fluids each day, some of which is water. The ratio she
drinks of water to other drinks is 5:3. How many ounces of water does Rachel drink
each day?
Water
16
16
16
16
16
= ? (80)
= 128
Other drinks
16
16
16
8 units = 128
128 ÷ 8 = 16
1 unit = 16
= 16
= 16
5 units of 16
5 • 16 = 80
Rachel drinks 80 ounces of water each day.
2. Mr. Edgett’s Algebra 2 class has both juniors and seniors. The ratio of juniors to
seniors is 4:1. If he has 30 students, how many of them are juniors?
Juniors
6
6
6
6
= ? (24)
= 30
Seniors
6
5 units = 30
30 ÷ 5 = 6
1 unit = 6
= 16
16 of 6
4=units
4 • 6 = 24
Mr. Edgett has 24 juniors in his class.