Question

complete the equation for this model.
10 11 12 13 14 15 16 17 18 19 20
□ + □ = □

Explanation:

Step1: Identify start and change

The number line starts at 17, and we add the value of the backward jump (3, since 20-17=3) to get to 20.

Step2: Write the addition equation

$$17 + 3 = 20$$

Answer:

$17 + 3 = 20$