calvin buys 3/5 pound of ground beef. he divides the beef into 6 equal portions.

a)find the weight of 1 portion of beef.
b)fin the weight of 4 portions of beef.

(3/5)/ 6 = (3/5) * (1/6) = 3/30 = 1/10

(1/10) * 4 = ?

3/(5*6) = 3/30 = 1/10 = 0.1

times 4 = 0.4

2/5

Right.

4 portions weighs 2/5 of a pound.

So what's the answer

much better 2/5 = 4/10 = 0.4

I don't get how I did that

Both the numerator and the denominator of 4/10 are divisible by 2.

4/10 = 2/5

1/10*4/1=4/10=2/5

Yay! You've got it!