8 fifths.
2/1 X 4/5
Multiply the numerator. (top)
2 X 4= 8
Multiply the denominator. (bottom)
1 X 5= 5
Put numerator and denominator together.
The answr is 8/5, which is an improper fraction. You can leave it like that in Algebra, but if you want ot simplify it more, divide 5 into 8.
1 3/5 is the more simplified answer.
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