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The decimal value of 21 is simply 21. In decimal form, whole numbers remain the same, so the decimal value of 21 is 21.
They are representations of numbers which need not be whole numbers.
It is already in decimal form, as 189.0 is the same as 189.
Any two composite numbers who do not share the same prime factors.15 = 5x322 = 11x2So 15 and 22 have a GCF of 1
The same as every other even numbers greater than 2, 124 is a composite number.