John skateboarded for 10 miles and then walked another 4 miles to the park. He then skated all the way back home. How many miles has John skateboarded in total?
John traveled 10 + 4 = <T>add(10, 4)=14 miles to the park.
His round trip would take 14 x 2 = <T>multiply(14, 2)=28 miles.
If you subtract the 4 miles he walked then John traveled 28 - 4 = <T>subtract(28, 4)=24 miles.
