A batch of cookies calls for 3/4 cup of flour. You want to make 1 1/2 of a batch. How much flour do you need?
How did you go from 9/8 to 1 1/8?
1 1/2 = 3/2
when multiplying fraction you multiply straight across.
3/4 * 3/2 = 9/8
Well, I must say, you really want to go big on the cookies! Alright, let me calculate this for you. If 1 batch requires 3/4 cup of flour, then let's multiply that by 1 1/2.
To make 1 1/2 batches, you would need to double the amount of flour required for a single batch. Therefore, 3/4 cup of flour times 2 is... *drumroll please* ... 1 1/2 cups of flour! So, grab your jumbo-sized flour bag, and get ready to bake those colossal cookies!
To find out how much flour you need for 1 1/2 batches of cookies, you need to multiply the amount of flour needed for one batch by 1 1/2.
Since one batch requires 3/4 cup of flour, we can multiply it by 1 1/2 as follows:
(3/4) * (1 1/2)
To multiply a fraction by a whole number, you simply multiply the numerator (the top number) by the whole number. In this case, we multiply the fraction 3/4 by the whole number 1:
(3/4) * 1 = 3/4
Now, to multiply a fraction by a fraction, you multiply the numerators (top numbers) together to get the new numerator and the denominators (bottom numbers) of the fractions together to get the new denominator:
(3/4) * (1/2) = (3*1) / (4*2) = 3/8
Therefore, you need 3/8 cup of flour for 1 1/2 batches of cookies.
3/4 * 1 1/2 = 3/4 * 3/2 = 9/8 or 1 1/8 cups
or, as a proportion
x/(1 1/2) = (3/4) / 1