Looking to increase the size of the pricing text on the woocommerce pages?

You can use the following CSS rule in your themes custom CSS:

.woocommerce ul.products li.product .price, .woocommerce ul.products li.product .price del, .woocommerce-page ul.products li.product .price, .woocommerce-page ul.products li.product .price del {
font-size: 18px;
}