Question

use counters to subtract 3 - 1. you start with: you subtract: which picture shows the difference?

Explanation:

Step1: Understand the subtraction

We start with 3 counters and subtract 1 counter.

Step2: Perform the subtraction

$3 - 1=2$.

Answer:

The picture with 2 counters shows the difference. So the first picture (with two "+" symbols in circles) is the correct one.