Jenna C. answered 03/15/19
Experienced Math Tutor, ages 10-18
The problem tells us that for each batch of cookies Maggie makes, she needs 1/4 kg of cake flour.
If Maggie is making 9 batches of cookies, we will need to multiply her ingredients by 9. To multiply the fraction 1/4 by 9, write 9 as a fraction: 9/1.
9/1 x 1/4 = 9/4
To write 9/4 as a proper fraction (in simplest form), divide 9 by 4. This will give you 2 with a remainder of 1, which means Maggie will need 2 1/4 kg of cake flour to bake 9 batches of cookies.