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Since 180 is a factor of 540, it is automatically the GCF.
The GCF is 180.
The GCF is 12.
180
180 540 ÷ 360 = 1 r 180 360 ÷ 180 = 2 r 0 ⇒ gcf = 180
The GCF is 108.
The GCF is 15.
540 minus 180 is 360.