Final answer:
To find out how many pages Kayla read before dinner, multiply the total number of pages she read on Friday by the fraction of reading she did before dinner.
Step-by-step explanation:
To find out how many pages Kayla read before dinner, we can multiply the total number of pages she read on Friday, which is 12 1/2, by the fraction of reading she did before dinner, which is 3/4.
To multiply a whole number and a fraction, we first convert the whole number to a fraction. 12 1/2 can be written as 25/2. Then, we multiply the numerators and denominators: (25/2) x (3/4) = (25 x 3)/(2 x 4) = 75/8.
Therefore, Kayla read 75/8 pages before dinner.