Worked example
A scale drawing uses 1 cm for 100 cm in real life. A line on the drawing is 2 cm long. What is its real length in centimeters?
Answer & why
Answer: 200
Each drawing centimeter represents 100 real centimeters. 2 × 100 = 200 cm.
Grade 7 · Math
Use a scale drawing
Convert a drawing measurement to a real measurement using a scale.
8 authored questions + worked example
Add to plan
All questions
All 8 authored questions for this skill.
Question 1
A scale drawing uses 1 cm for 75 cm in real life. A line on the drawing is 8 cm long. What is its real length in centimeters?
- 602
- 600
- 599
- 601
A hint
Multiply the drawing measurement by the real length represented by one unit.
Answer & why
Answer: 600
Each drawing centimeter represents 75 real centimeters. 8 × 75 = 600 cm.
Question 2
A scale drawing uses 1 cm for 30 cm in real life. A line on the drawing is 9 cm long. What is its real length in centimeters?
- 271
- 269
- 270
- 272
A hint
Multiply the drawing measurement by the real length represented by one unit.
Answer & why
Answer: 270
Each drawing centimeter represents 30 real centimeters. 9 × 30 = 270 cm.
Question 3
A scale drawing uses 1 cm for 100 cm in real life. A line on the drawing is 2 cm long. What is its real length in centimeters?
- 199
- 202
- 201
- 200
A hint
Multiply the drawing measurement by the real length represented by one unit.
Answer & why
Answer: 200
Each drawing centimeter represents 100 real centimeters. 2 × 100 = 200 cm.
Question 4
A scale drawing uses 1 cm for 200 cm in real life. A line on the drawing is 3 cm long. What is its real length in centimeters?
- 602
- 600
- 599
- 601
A hint
Multiply the drawing measurement by the real length represented by one unit.
Answer & why
Answer: 600
Each drawing centimeter represents 200 real centimeters. 3 × 200 = 600 cm.
Question 5
A scale drawing uses 1 cm for 50 cm in real life. A line on the drawing is 4 cm long. What is its real length in centimeters?
- 199
- 202
- 200
- 201
A hint
Multiply the drawing measurement by the real length represented by one unit.
Answer & why
Answer: 200
Each drawing centimeter represents 50 real centimeters. 4 × 50 = 200 cm.
Question 6
A scale drawing uses 1 cm for 80 cm in real life. A line on the drawing is 5 cm long. What is its real length in centimeters?
- 400
- 401
- 402
- 399
A hint
Multiply the drawing measurement by the real length represented by one unit.
Answer & why
Answer: 400
Each drawing centimeter represents 80 real centimeters. 5 × 80 = 400 cm.
Question 7
A scale drawing uses 1 cm for 25 cm in real life. A line on the drawing is 6 cm long. What is its real length in centimeters?
- 152
- 150
- 151
- 149
A hint
Multiply the drawing measurement by the real length represented by one unit.
Answer & why
Answer: 150
Each drawing centimeter represents 25 real centimeters. 6 × 25 = 150 cm.
Question 8
A scale drawing uses 1 cm for 40 cm in real life. A line on the drawing is 7 cm long. What is its real length in centimeters?
- 280
- 282
- 279
- 281
A hint
Multiply the drawing measurement by the real length represented by one unit.
Answer & why
Answer: 280
Each drawing centimeter represents 40 real centimeters. 7 × 40 = 280 cm.