That is the answer because the first grid is in hundredths, so if you turn it into fractions you need to count the shaded parts. so it is 42/100 for the first one. Now because the second one is not in hundreths but in tenths, you make it into hundredths by multiplying 10 this will make the 3/10 into 30/100. Now that is fixed you just need to add 42/100 and 30/100 together which is 72/100. That is your final answer. D
