Ns1.3
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N.S. 1.3: Use proportions to solve problems. Use cross-multiplication as a method for solving problems, understanding it as the multiplication of both sides of an equation by a multiplicative inverse.
1
What is x? 3 5
=
4
x 10
11 3
22 h
A B
6 8
A B
5
C
14
C
6
D
16
D
16
2 3
A B C D
=
=
12 y
z 8
4 5 14 16
∆BAT is similar to ∆CAR. What is the length of AT?
QuickTimeª and a decompressor are needed to see this picture.
A B C D
What is y? 5 8
What is z? 19 38
3
=
3 2 5
5 2
What is h?
10 cm 13 cm 15 cm 20 cm
Download this document from http://amylisresources.blogspot.com
A B C D
6
7.5 15 19.2 20
The ratio of boys it girls in Ms. Li’s math class is 3 to 5. How many boys are in her class if there are 20 girls? A B C
10 12 21
D
30
N.S. 1.3: Use proportions to solve problems. Use cross-multiplication as a method for solving problems, understanding it as the multiplication of both sides of an equation by a multiplicative inverse.
7
Janna uses 4 eggs to make 7 pounds of potato salad. If she makes 35 pounds of potato salad for the school barbecue, how many eggs will she need?
A B C D
8
20 25 28 32
Mark made a scale model of his house for a class project. How tall is Jeremy’s actual house?
QuickTimeª and a decompressor are needed to see this picture.
A B C D
16 feet 18 feet 23 feet 25 feet
Download this document from http://amylisresources.blogspot.com
1
What is x? 3 5
=
4
x 10
11 3
22 h
A B
6 8
A B
5
C
14
C
6
D
16
D
16
2 3
A B C D
=
=
12 y
z 8
4 5 14 16
∆BAT is similar to ∆CAR. What is the length of AT?
QuickTimeª and a decompressor are needed to see this picture.
A B C D
What is y? 5 8
What is z? 19 38
3
=
3 2 5
5 2
What is h?
10 cm 13 cm 15 cm 20 cm
Download this document from http://amylisresources.blogspot.com
A B C D
6
7.5 15 19.2 20
The ratio of boys it girls in Ms. Li’s math class is 3 to 5. How many boys are in her class if there are 20 girls? A B C
10 12 21
D
30
N.S. 1.3: Use proportions to solve problems. Use cross-multiplication as a method for solving problems, understanding it as the multiplication of both sides of an equation by a multiplicative inverse.
7
Janna uses 4 eggs to make 7 pounds of potato salad. If she makes 35 pounds of potato salad for the school barbecue, how many eggs will she need?
A B C D
8
20 25 28 32
Mark made a scale model of his house for a class project. How tall is Jeremy’s actual house?
QuickTimeª and a decompressor are needed to see this picture.
A B C D
16 feet 18 feet 23 feet 25 feet
Download this document from http://amylisresources.blogspot.com
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