Verdict. The Microsoft Lumia 638 is an attractive budget friendly smartphone with the latest Windows OS and support for 4G LTE Cat4. It features a powerful Qualcomm Snapdragon processor but the lack of front camera is a big disappointment.
Steps. 1. Make sure that the denominators of every fraction that you're going to add or subtract are the same. 1  If the numbers are different, you can't add or subtract the fractions as-is.2  You can, however, perform the operations necessary to create fractions with like denominators, in which case you can add and subtract them.teps. 1. Make sure that the denominators of every fraction that you're going to add or subtract are the same. 1  If the numbers are different, you can't add or subtract the fractions as-is.
First there is a trick to help you do this. 2/3 divided by 4/5 turns into 2/3 x 5/4. you just use a reciprocal. then you multiply the numerators (2x5=10 and then the denominators (3x4=12) so your answer would be 10/12 which if u divide by 2, it will reduce it to 5/6.irst there is a trick to help you do this. 2/3 divided by 4/5 turns into 2/3 x 5/4. you just use a reciprocal. then you multiply the numerators (2x5=10 and then the denominators (3x4=12) so your answer would be 10/12 which if u divide by 2, it will reduce it to 5/6.