Vocabulary
What is a ratio?
A comparison between two quantities
Write a ratio to compare the value of a dime to the value of a nickel
10:5
Find an equivalent ratio for 2:5
4:10, 6:15, 8:20, etc.
What is the percent of 5/100?
5%
What is a percent?
A part of 100
What are the 3 ways to express a ratio? Use 5 cats, 4 dogs to show how.
5:4, 5 to 4 and 5/4
Find an equivalent ratio to 5:6 by scaling up. Explain how you found it
10:12, etc. I multiplied each part by the same number (5x2=10 and 6x2=12)
If Jaime got 78 questions out of 100 right on her test, what would her percent grade be?
78%
What is an equivalent ratio?
A ratio that has the same value as another ratio. Example: 1:2 = 50:100
Jade is making slime. She needs 4 parts glue to 2 parts activator. Write a ratio to compare the ingredients
glue: slime = 4:2
Find an equivalent ratio to 15:25 by scaling down. Explain what you did.
3:5, I divided both parts by the same number (15*5=3 and 25*5=5)
1/2 is equal to which percent? Write an equivalent fraction.
50% 50/100
What is a fraction?
Equal parts of a whole. It has a numerator and a denominator.
There are 18 eleven year olds and 7 ten year olds in Mrs. N's grade 5 class. Write a part to whole ratio to compare the number of 11 year olds.
18: 25
Find 3 equivalent ratios to 2:7. Write them as a fraction.
Example: 4/14, 6/21, 8/28 (multiply by 2 then 3 then 4)
If Jane failed her test, what might her percent score have been? Give a range ?-? %
0-49% because 50% is needed to pass
What is a part to part ratio?
When two parts are compared to each other rather than the whole
For every 2 blonde haired pupils there were 4 with black hair. There were 8 blonde hair pupils. How many people with black hair are there?
8:16
@@@@@@@@ &&&&&&
Write a ratio for the model above then draw an equivalent ratio.
8:6
@@@@@@@@@@@@@@@@ (16)
&&&&&&&&&&&& (12)
In a group of 100 children, 11 cannot swim, which percent of children can swim?
89% (100-11=89)