The LCM of 5 and 4 is 20, this is the denominator. Dividing by fractions. Dividing by a number is equivalent to multiplying by the reciprocal of that number. But what's a reciprocal? The ...

Maryland teachers Terry Wheeler and Dawn Caine taught the group four ways to represent division of fractions by fractions—not one of them was the “invert and multiply” rule that all of the ...

A key to preventing such errors is to teach students the flip and multiply approach before they learn to divide fractions rather than as something unique to fractions. The point being that the ...