Question

make this into a short simple sentence:
To ensure that Nate and Clara each have a full set of 8 markers, they can trade markers with each other.

Nate currently has 9 markers and Clara has 7 markers. Since Nate has one extra marker, he can give 1 marker to Clara.

Here's how it would work:

Nate gives 1 marker to Clara.
After the trade:
Nate will have 9 - 1 = 8 markers.
Clara will have 7 + 1 = 8 markers.
Now, both Nate and Clara will each have a full set of 8 mark

Answer 1

Nate gives Clara 1 marker so they both have 8.