Posted by Marissa on Thursday, December 9, 2010 at 7:01pm.
What steps do we use to change 1-1/2 cups in half?
- 6th grade - Writeacher, Thursday, December 9, 2010 at 7:05pm
3/2 divided by 2 = 3/2 * 1/2 = ??
- 6th grade - Ms. Sue, Thursday, December 9, 2010 at 7:06pm
Change 1 1/2 to an improper fraction.
(1/2) * (3/2) = 3/4
- 6th grade - Marissa, Thursday, December 9, 2010 at 7:13pm
I was told that when dividing a mixed number you write the reciprocal of the second number and then multiply and that will change the answer.
- 6th grade - Ms. Sue, Thursday, December 9, 2010 at 7:15pm
You only use the reciprocal when the original problem is a division problem.
Your problem is a straight multiplication problem.
- 6th grade - Marissa, Thursday, December 9, 2010 at 7:55pm
Isn't this a division problem? I have to divide 1-1/2 into two parts.
- 6th grade - Ms. Sue, Thursday, December 9, 2010 at 8:07pm
It's the same thing.
(3/2) / 2 = (3/2) * (1/2)
The simpler way is to remember that "of" in a math problem means to multiply.
(3/2) * (1/2) = 3/4
- 6th grade - Marissa, Thursday, December 9, 2010 at 8:19pm
Thank you very much for your help. I had the same answer. I'm trying to explain the reciprocal to my daughter, she is worried that her teacher will say the answer is wrong.
- 6th grade - Ms. Sue, Thursday, December 9, 2010 at 8:40pm
You're very welcome.
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