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Introduction to addition: combining dots

There are 10 purple dots 🟣 and 10 red dots 🔴. How many total dots are there?

🟣🟣🟣🟣🟣🟣🟣🟣🟣🟣

🔴🔴🔴🔴🔴🔴🔴🔴🔴🔴