Attention Mathie People:

My DS in 3rd Grade wrote this answer on a school paper:

What would you like to learn about this year:
Square root decimals

Then I asked,
Do you know decimals?
I know some of them

Do you know square roots?
Last year when I was trying to figure it out and I didn't, Dad told me what they were and I understood. I want to learn Square Root decimals.

What would I do with this? He is doing 3rd and 4th grade math, skipping some stuff he doesn't need. Is square root decimals for later?