Ben says 7 9/100 must be less than 7 2/10 because 9 hundredths is less than 2 tenths. do you agree? draw a number line to show how you know

Ben is correct because when the numbers are drawn as decimals, they are 7.09 and 7.2. see picture for number line.

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)