Understanding how to add complex numbers is important for 9th-grade students for a few reasons:

1. Building Blocks for Future Learning: Learning how to add complex numbers helps students get ready for more difficult subjects like algebra, calculus, and engineering.

2. Real-Life Uses: This math skill is used in areas like electronics and physics. It shows students how math is relevant to their daily lives.

3. How to Add in Standard Form: When you add two complex numbers, like $a + bi$ and $c + di$, you combine the real parts and the imaginary parts.

   This looks like this: $(a+c) + (b+d)i$.

Learning these techniques gives students the confidence they need to take on more complicated problems!