#. Change the verbal phrases/sentences to mathematical phrases/sentences and vice versa. VERBAL PHRASES/ SENTENCES MATHEMATICAL PHRASES/ SENTENCES The difference of a number and 15. 20 *X-30 15 + 3 the total of y and 100 the product twice a number and 8 is 40 m/2 10 times the difference of 12 and a number The sum of a number and five is four.