Calculation method: 50000 cm =0.5 km 1.8÷0.5=3.6 cm.

Proportioning method:1.8km =180000 cm1:50000 = x:180000.

The second empty method for finding the distance on the graph is the same as above.

Find the actual distance in the third space.

Formula method 600000000 cm = 600 km 600×15 = 9000 km.

Proportional method 15: x = 1: 60000000.

The answer to question 5 is:

Formula: 400000000 cm = 400 km1900 ÷ 400 = 4.75 cm.

Proportioning method:1900km =1900000cm1:4000000 = x:1900000.

Answer to question 6:

Formula method 5000000 cm =50 km 3.4×50= 170 km.

Proportional method 3.4: x = 1: 5000000.

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