On each of 3 days, derrick rode 6.45 km to school, 150 meters to the library, and then 500 meters back home. how many kilometers did he ride for the 3 days altogether?

21.3 km

Step-by-step explanation:

Given: On each of 3 days the distance traveled by Derrick to school = 6.45 km

The distance rode by Derrick to library = 150 meters

Since, 1 m=

Thus, the distance rode by Derrick to library =

The distance rode by Derrick to home = 500 meters.

Thus, the distance rode by Derrick to home =

Distance he rode in each day =

Now, Distance he rode in 3 days =

21.3 km.

Step-by-step explanation:

On each of 3 days, Derrick rode 6.45 km to school, 150 meters to the library, and then 500 meters back home.

We know that

1 km  = 1000 m

6.45 km = 6450

Total distance covered by Derrick in one day = 6450+150+500 meters

                                                                            = 7100 meters

                                                                            =7.1 kilometers

The distance covered by Derrick on each day is 7.1 km. So, the distance covered by Derrick in 3 days is

Therefore, Derrick rides 21.3 km for the 3 days altogether.