The answer process is as follows:

1, the first round trip means one-to-one, two round trips. One round trip is twice.

2. Going back and forth from home to school twice means going back and forth from home to school twice, so multiply by 4.

3. Suppose the example from home to school is 1000m, then the total distance from home to school is 1000×4=4000m.

Extended data:

To understand the meaning of the word round trip, it is often used in mathematical application problems and generally appears in the problem of finding distance.

Round trip source:

1. In the Tang Dynasty, Ma Dai wrote a poem called "The Home of the Wild Old Man in Jinghu Lake": "Looking for a gentleman in the lake, the wind blows back and forth." Looking for the king in the lake, the wind blows back and forth.

2. One of RoyceWong's Poems of Joining the Army: "It takes three thousand miles to travel, and the round-trip speed flies." It means: Mercedes-Benz travels 3000 miles on land, and the round trip is as fast as flying.

3. Qing: Fang Wei? "Preface": "You have a father's wind, and you have traveled more than 4,000 miles for the danger of the three rivers merging with Li Peng."

4. Bing Xin? "Send a little reader" 26: "The lake is wide and travels ten miles back and forth.

References:

Baidu encyclopedia-round trip