Ratios
Simplify the ratio: 8 to 30
4 to 15
A car travels 480 miles with 16 gallons of gas. How many miles can it travel per gallon of gas?
(divide the large number by the small number!)
30 miles per gallon
Do each pair of ratios form a proportion? 2/3 and 6/9
YES
The diameter of the circle is 7in. Find the Circumference of the circle.
C=pi x d
What is 21.99=21
A = pi x r2
A= pi x 42
A= 50.3
Simplify the ratio: 30 to 5
6:1
3 boxes can hold 12 books. How many books are held in each box?
(divide the large number by the small number!)
There are 4 books in each box
Do the ratios form proportions? 21/6 and 14.3/3 hr
No
The radius of the circle is 6 in. What is the Circumference?
C= 2 x pi x r
C= 37.69 = 37.7
The diameter of the circle is 10 in. What is the area?
A= pi r2
A= pi x 52
A= 78.5 in2
Simplify the ratio: 24 to 6
4:1
136 students fit into 8 classrooms. How many students can 1 classroom hold?
(divide the large number by the small number!)
17 students fit into 1 classroom.
Do the ratios form proportions? 8/20 and 24/60
Yes
We need to measure around the outside of a circle rug. The radius measures 11 in. What is the Circumference?
C= 2 x pi x r
C= 2 x pi x 11
C= 69.1
We need to measure the space the circular picture that is on the wall. The radius is 6 in. What is the area?
A = pi x r2
A= pi x 62
A= 113.1
There are 140 total students. 80 of the students are girls, and 60 of the students are boys. Write the ratio of girls to total students.
80:140
There are 52 pints of juice in 4 containers. How many pints of juice are in each container?
(divide the large number by the small number!)
There are 13 pints in each container
Do the ratios form proportions? 5/7 and 25/49
What is No
TRUE OF FALSE: A DIAMETER IS A CHORD
TRUE
TRUE OR FALSE: A CHORD IS ALWAYS A DIAMETER
FALSE
What is the ratio of I's to total letters in the word "Mississippi"?
4:11
A teacher speaks 1500 words in 25 minutes. How many words does she speak per minute?
(divide the large number by the small number!)
She speaks 60 words per minute
Do the ratios form proportions? 5/4 and 25/16
What is No
The diameter of the cookie is 2.5 in. What is the circumference?
C = pi x d
C= pi x 2.5
C= 7.85 in
The diameter of the circle is 13 cm. What is the radius and area?
Radius: 6.5
A= pi x r2
A= pi x 132
A= 530.9 cm2