It's just reverse simplifying. Most people would be asking, "how do you turn 4 10ths into 2 5ths?". So instead of DIVIDING the fraction by two, you would MULTIPLY the fraction by two.
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2 fifths
6 tenths 2/5 = 4/10 2/10 + 4/10 = 6/10
No - five tenths is equal to a half. Four fifths is equal to eight tenths.
7 fifths
Four-tenths, or two-fifths.