Solve the Equation: (-12) + ? = 30 | Finding the Missing Addend

Question

$(-12)+(?)=30$

00:00 Complete the missing

00:03 Let's start from point (-12) on the negative (left) side of the axis

00:10 This is the desired number, let's find it on the axis

00:14 Let's find its distance from point (-12)

00:19 The direction of progression is to the right (positive)

00:44 And this is the solution to the question

Let's count on the number line the steps between -12 and 30.

We can see that 42 steps are required:

$42$