look at the factors of 4 and 10
4 = 2 x 2
10 = 2 x 5
both are divisible by 2
4/10 = 2/5
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3/10 times 4/100 = 3/250 in its lowest terms
0.6 or 6/10 which is 3/5 in its lowest terms
Expressed as a vulgar fraction in its lowest terms, 0.9 is equal to 9/10, or nine tenths.
4/100 = 1/25 in its lowest terms
Nine tenths minus four tenths is five tenths, which is also a half.