Question

if you double a recipe that requries 1, 1/2 of flour, how much flour will you need?

Answer 1

what is 2* 1 1/2?

Answer 2

No, what is 2 * 1 + 1/2

Answer 3

Hint: 2/2 = 1
and to add fractions you need to have the same denominator

Answer 4

Also notice that

2 = 2/1

and to multiply fractions

y/x * d/c = dy/cx

Answer 5

so
First solve the addition of fractions

1 + 1/2
you can't add fractions with different denominators
1/1 = 1 as 1 goes into 1, one times
notice though that
2/2 = 1 as 2 goes into 2, two times

thus we can write the problem like this

2/2 + 1/2
when adding fractions add the numerators

so we have

(2 + 1)/2
thus
3/2

so we have

two times 3/2

2 * 3/2

Notice that
2/1 = 2, as 1 goes into 2, two times

so we can right the problem like so

(2/1)*(3/2) = (2)(3)/(1)(2)
=
6/2 is the amount of flour we need

2*(1 + 1/2)
= 2*(3/2)
= 6/2 or 3 cups