873 Math Blog

Question 1: 1 3/4 + 1 1/8= 2 7/8
First off you have add up the whole numbers. So we add 1 to 1 and we get 2 (1+1=2).
Second you have to find the common denominator. So we multiply 4 to 8 and we get 32. (4x8=32). Since the half of 32 is 16, we find out if 4 can go into 16 and if 8 can go into 16.
So first we list the multiples of 4 and 8 (4=4,8,10,12,14,16,20)(8=8,16)(the common factor is 16. So we found out that there was and it was 16.So we put the 16 as a denominator.I knew 3 quarters of 16 were 12 and 1 eighth of 16 was 2. Then after, you just add the fractions and it would be 14. But since 14 and 16 were equal, i divided it by 2. So the fractions is 7 over 8.

Question 2: 2 4/5 + 1 1/2 = 4 3/10
i made denominator because 2x5 is 10.Then I made the numerator 8 because 5 fits into 10, 2 times. Then I made the other numerator 5 because 2 fits into 10, 5 times.I knew that 8=5 would make 13 and 13/10 is an improper fraction so i divided 13 to 10. 13 divided by 10 equals 1 and 3/10. i know there is 3 more wholes so i add 3 to 1 and 3/10 which made 4 and 3/10.