
Jon S. answered 02/09/22
Patient and Knowledgeable Math and English Tutor
Find a common denominator between 10 and 5 - the smallest number both divide evenly into
That would be 10.
Change 2/5 to have denominator 10, by multiplying numerator and denominator by 2:
2 * 2 = 4
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5 * 2 10
Now add 3/10 + 4/10 = (3 + 4)/10 = 7/10