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Farah compares two numbers, 4,809 and 4,890, and says 4,809 is bigger because it ends in 9

Farah compares two numbers, 4,809 and 4,890, and says 4,809 is bigger because it ends in 9, and 9 is the biggest single digit. Her brother says you have to compare digit by digit starting from the left, not just look for a big digit anywhere. Who is right?

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