A cookie recipe calls for 2 1/4 cups of flour. If Gustavo wants to make 1 1/2 times the recipe, how much flour does he need?
2 1/4 + 1 1/2
9/4 + 3/2 * 2
9/4 + 6/4 = 15/4 = 3 3/4
Is correct?
No.
Don't add. Multiply 2 1/4 by 1 1/2.
9/4 + 3/2
(9 +6)/4 = 15/4 = 3 3/4
yes it is.
Yes, your calculation is correct. To find out how much flour Gustavo needs, you need to multiply the original amount of flour by 1 1/2.
The original amount of flour is 2 1/4 cups.
To multiply by 1 1/2, you can convert the mixed number 1 1/2 to an improper fraction by multiplying the whole number (1) by the denominator (2) and adding the numerator (1) to get 3/2.
Now, you multiply the original amount of flour (2 1/4) by the improper fraction 3/2:
2 1/4 * 3/2 = 9/4 * 3/2 = 27/8 = 3 3/8
Therefore, Gustavo needs 3 3/8 cups of flour to make 1 1/2 times the cookie recipe.