Question

As an estimation we are told 5 miles is 8 km.
Convert 40 miles to km.
km

Answer 1

Step-by-step explanation:

5 miles=8 km

=)1 mile=8/5 km=1.6 km

=)40 miles=1.6×40=64 km

So, 40 miles is 64 km.

Answer 2

Write a direct proportion to compare miles to Km.

5

8

=

80

x

←

miles

←

km

You could decide what

5

was multiplied by to give

80

and do the same to the

8

.

5

8

×

16

16

=

80

128

←

miles

←

km

Or Cross multiply to get:

5

x

=

8

×

80

x

=

8

×

80

5

x

=

128

km

OR Find a conversion factor:

5

miles

=

8

k

m

1

mile

=

8

5

k

m

80

miles

=

80

×

8

5

=

128

k

m

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