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.
2. Multiply the numerators of the two fractions. Since the numerators are both 2, you can multiply 2 * 2 to get 4. 3. Multiply the denominators of the two fractions. Since the denominators are both 4, just multiply 4 * 4 to get 16.1  Your answer is a fraction comprised of the new numerator and the new denominator.2  Your answer is 4/16.ince the numerators are both 2, you can multiply 2 * 2 to get 4. 3. Multiply the denominators of the two fractions. Since the denominators are both 4, just multiply 4 * 4 to get 16. 1  Your answer is a fraction comprised of the new numerator and the new denominator. 2  Your answer is 4/16.