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.
To multiply fractions, first we simplify the fractions if they are not in lowest terms. Then we multiply the numerators of the fractions to get the new numerator, and multiply the denominators of the fractions to get the new denominator.Simplify the resulting fraction if possible.Note that multiplying fractions is frequently expressed using the word of.. For example, to find one-fifth of 10 pieces of candy, you would multiply 1/5 times 10, which equals 2. Study the example problems to see how to apply the rules for multiplying fractions.implify the resulting fraction if possible. Note that multiplying fractions is frequently expressed using the word of.. For example, to find one-fifth of 10 pieces of candy, you would multiply 1/5 times 10, which equals 2.