Ratios And Rates Worksheet - Chapter 3 Page 13
ADVERTISEMENT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38Example 1
Using a ratio table
I used a ratio table to help me solve the problem.
Preston’s Solution
The ratio of girls to boys is 2 : 3.
I drew a two-row table and wrote the ratio of
girls to boys in the first column. I decided to
Girls
2
put girls on the top row, but I did not have to.
Boys
3
42
I needed an equivalent ratio for 42 boys.
I created some equivalent ratios, hoping I
x 2
x 5
would see a connection to a ratio with 42 boys.
I got equivalent ratios by multiplying both
Girls
2
4
20
numbers in a column by the same amount.
Boys
3
6
30
42
I picked numbers that were easy to multiply
x 2
x 5
by. I wrote the equivalent ratios in other
columns.
I saw that I had a column with 30 boys, and I
knew I needed to have a column with 42 boys
in it. I realized that, if I multiplied the second
Girls
2
4
20
8
column by 2, I would get a column with
Boys
3
6
30
12
42
12 boys. Then I could add the columns with
+
30 boys and 12 boys to get a column with
42 boys.
+
Girls
2
4
20
8
28
Boys
3
6
30
12
42
+
The ratio 28 : 42 is equivalent to the original
So 28 girls signed up for the trip.
ratio of 2 : 3.
114
Chapter 3
NEL
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Education