To reduce a number to its lowest terms, you have to divide both the numerator and the denominator by their greatest common factor (the largest number that you can divide both numbers by). In this case, that number is 5, because you can divide both 5 and 10 evenly by it. Once you divide both numbers by the GCF, your result will be 1/2.
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7/10 is in its lowest terms.
If you reduce it to lowest terms then it would be 1 over 10 or 0.10
5/4
1/10
126/420 = 3/10 in its lowest terms