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Workbook Scale Down, Scale Up
104-B1-1 104-B1-2
Ratios and Proportions 2. Use the proportion to find b.
1. Use the proportion to find a. Example
1.2 b
Example a 3 12
4 18
6
a. 1 a b. 6 a c. 25 35 a. 1.5 b b. 1.6 b c. 4 10
2 10 14 7 10 a 6 18 2.4 9 1.2 b
d. 18 12 e. a 12 f. 18 42 d. 3.9 6 e. 0.2 8 f. b 20
24 a 9 27 a 56 2.6 b b 28 3.5 28
g. a 80 h. 27 18 i. 74 37 3.5 8 6.2
5 40 a 42 60 a 7 32 1.2
b b b
g. 2 h. 1.6 i. 3
Objective Use the proportion to find the Objective Use the proportion to find the
unknown number. unknown number.
Textbook Reference Lead-In Textbook Reference Lead-In
104-B2-1 104-B2-2
Scale 2. Show your work and find the unknown length.
1. Show your work and answer each question. Example
Example Scale: 2 in. : 3 ft
Jessica’s height in the picture is 5 cm. What is Jessica’s actual height? Length in the picture: a in.
Actual length: 12 ft
Scale 1 cm : 30 cm
a. The length of the car in the picture is 2 in. What is the actual length of the car? a. b.
Scale: 3 in. : 5 yd Scale: 2 cm : 7 m
Scale 1 in. : 2.5 m Length in the picture: a in. Length in the picture: a cm.
b. The height of the chair in the picture is 5 cm. What is the actual height of the Actual length: 30 yd Actual length: 21 m
chair? c. Scale: 1.5 in. : 6 ft d.
Length in the picture: 6 in. Scale: 6 cm : 5 mm
Scale 1 cm : 6.4 in. Actual length: a ft Length in the picture: 36 cm
Actual length: a mm
Objective Use scale to determine the actual Objective Use scale to determine the
length of the object. unknown length.
Textbook Reference Activity 1 Textbook Reference Activity 1
194 NUMINO Teacher s Guide
Workbook Scale Down, Scale Up
104-B1-1 104-B1-2
Ratios and Proportions 2. Use the proportion to find b.
1. Use the proportion to find a. Example
1.2 b
Example a 3 12
4 18
6
a. 1 a b. 6 a c. 25 35 a. 1.5 b b. 1.6 b c. 4 10
2 10 14 7 10 a 6 18 2.4 9 1.2 b
d. 18 12 e. a 12 f. 18 42 d. 3.9 6 e. 0.2 8 f. b 20
24 a 9 27 a 56 2.6 b b 28 3.5 28
g. a 80 h. 27 18 i. 74 37 3.5 8 6.2
5 40 a 42 60 a 7 32 1.2
b b b
g. 2 h. 1.6 i. 3
Objective Use the proportion to find the Objective Use the proportion to find the
unknown number. unknown number.
Textbook Reference Lead-In Textbook Reference Lead-In
104-B2-1 104-B2-2
Scale 2. Show your work and find the unknown length.
1. Show your work and answer each question. Example
Example Scale: 2 in. : 3 ft
Jessica’s height in the picture is 5 cm. What is Jessica’s actual height? Length in the picture: a in.
Actual length: 12 ft
Scale 1 cm : 30 cm
a. The length of the car in the picture is 2 in. What is the actual length of the car? a. b.
Scale: 3 in. : 5 yd Scale: 2 cm : 7 m
Scale 1 in. : 2.5 m Length in the picture: a in. Length in the picture: a cm.
b. The height of the chair in the picture is 5 cm. What is the actual height of the Actual length: 30 yd Actual length: 21 m
chair? c. Scale: 1.5 in. : 6 ft d.
Length in the picture: 6 in. Scale: 6 cm : 5 mm
Scale 1 cm : 6.4 in. Actual length: a ft Length in the picture: 36 cm
Actual length: a mm
Objective Use scale to determine the actual Objective Use scale to determine the
length of the object. unknown length.
Textbook Reference Activity 1 Textbook Reference Activity 1
194 NUMINO Teacher s Guide
