The athlete needs to walk 1000 m, he completed 3a 2 laps of 400m. How long does he have to go?

We find the total distance that the athlete has already covered.

To do this, multiply the number of circles by their length.

We get:

400 * 2 = 800 meters.

To find out how many meters the athlete still has to walk, it is necessary to subtract the distance traveled from the indicated distance.

The result will be:

1000 – 800 = 200 meters.

Solving the problem through the expression:

1000 – (2 * 400) = 1000 – 800 = 200 meters.

Answer: The athlete has to walk 200 meters.