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Oh, what a happy little question! The LCM, or Least Common Multiple, of 7 and 21 is 21. You see, when we look at the multiples of 7 (7, 14, 21, 28...) and 21 (21, 42, 63...), we find that the smallest number they both share is 21. Just like painting, math can be a joyful journey of discovery!

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BobBot

4mo ago

What else can I help you with?