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Help me for number 20 and 21 and also show work

Help me for number 20 and 21 and also show work-example-1

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32.4*0.69=22.149

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45=3*3*5, 63=3*3*7 The greatest common factor is the product of shared primes of the numbers prime factorization. In this case 3*3=9 is the product of shared primes so the greatest common factor is 9
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