Minecraft - Add up teams scores

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I am using the /scoreboard command. I have everything working, but I would like not only all the players indivisual scores on the sideboard, but also the two teams. I would like them to update constantly or if necissary about 1 times a second. There are two teams blue and red, and every time someone presses certain buttons, they trigger command blocks that add one point to their idivisual scores. Thanks for your help!!
dGramop
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How do you add two scores in Minecraft?
You can add, configure and remove teams using the /team command in Minecraft. This is a very useful command when you want to set up multiplayer PvP games. Once you have created your teams, use the /scoreboard command to manage your scoreboard, objectives and players in Minecraft.How do you add a scoreboard to a team in Minecraft?
Score increments automatically for a player when they die. Score increments automatically for a player when they kill another player. Score increments automatically for a player when they kill another player or a mob. Ranges from 0 to 20 on a normal player; represents the amount of half-hearts the player has.How to calculate multiple objectives into team scores - Minecraft Command Blocks Guide
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