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Regrouping with decimals: 21.3

Sal regroups 21.3 into various addition problems. Created by Sal Khan.

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• Does anyone ever end up doing addition in hundreds by accident😅
• can we expand 999999999999999999.444444444444444444444444444444444444444444444444446666666666666666666666666666655555555555555555999999999444444444488888888888888888888888888
• Yes, but its gonna take a long time.
• Hello, I am very confused with doing regrouping and I just dont get it, well I do get it its just I am not the best at it, and when it comes down to decimals even worse!

When I do some khan academy assignments during online schooling, I have assignments that my teacher assigns and the question that it asks it says ( for example.) (9.0- 12.0) Something like that and when it comes down to the hundredths I am really bad!

help!
• what! How do you do this
• Pues la luna se coloca entre el sol y la tierra y al momento de hacer eso la luna proyecta una sombra enorme sobre la tierra y desde nuestra perspectiva la luna se ve muy grande.
• Sí, estoy de acuerdo, la luna proyecta una gran sombra.

Pero ¿qué tiene que ver con las matemáticas?
• I don't get why he uses different colors. Instead he could probably use one color and underline in another color?
• He uses different colors for them so you can see the numbers better..