Question

What is the answer on each of three days Derrick rose 6.45 km to school 150 meters to the library and than 500 meters back home how many kilometers did he ride for the 3 days altogether

Answer 1

500+150=650. Then do 650+6.45=12.95

Answer 2

150=0.15
500=0.5
6.45
0.15
+0.5
-------
7.10