Ron used 3/5kg of flour to make bread and 2/7kg of flour to make scones how many more kg of lour did he use to make bread than scines

1 answer

Subtract them...
But to subtract fractions you need a common denominator (the smallest thing that 5 and 7 both go into)
Remember when making equivalent fractions with your common denominator (which is 7x5 = 35) make sure you multiply the top by whatever you multiplied the bottom by...
So 3/5 is equal to 3x7/5x7
that is
21/35
now you try...