Possibly because 80 is 1/10 of 800
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30% of 800 = 240 = 30% * 800 = 30%/100% * 800 = 3 * 80 = 240
800 multiplied by 80 is 64,000.
800 divided by 10 is 80. So the answer is 80.
800 less 80% of it is 100% - 80% = 20% left. 20% of 800 is 20/100 x 800 = 160.
The GCF is 80.