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A number is greater than another number if it is more positive than the second number.
21.1 is more positive than 20.
If you want to think of it in terms of the number line:
If you write the number line horizontally with negative numbers to the left, zero in the middle and positive numbers to the right a number is greater than another if it is to the right (on the number line) than the second.
21.1 is to the right of 20, so 21.1 is greater than 20.
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