Write down the fraction. For example, you might have 5/7.
Write a new denominator, which is a multiple of the original denominator. For instance, if you wanted to double the terms of the example fraction, you would write a 14 in the denominator of the second fraction (because 7 times 2 is 14).
Multiply the numerator of the original fraction by the factor that you used to multiply the denominator of the original fraction. In this example, you multiplied 7 by 2. Therefore, you would multiply 5 by 2 to get 10. The new fraction, which is an expression of the original fraction in higher terms, would be 10/14.