Posted by Erin on Wednesday, April 29, 2009 at 10:16pm.
Divide 30 by half and add 10. What do you get? I think it is 70, but my friend disagrees. He thinks it's 12.

Math  Anonymous, Wednesday, April 29, 2009 at 10:24pm
It is 70 unless you are actually dividing by 2 instead of one half.
30 / (1/2) = 30 * 2 = 60
60 + 10 = 70
I don't understand how your friend got 12.

Math  Sammy, Wednesday, April 29, 2009 at 10:24pm
i think it is 25. Both your friend and you are wrong because when you divide 30 by half you get 15.So 15+10=25.

Math  Ms. Sue, Wednesday, April 29, 2009 at 10:27pm
30 / 1/2 = 30 * 2 = 60
60 + 10 = 70
You are right!!! :)

Math  Erin, Wednesday, April 29, 2009 at 10:32pm
Your not dividing IN half, but BY half. I did it the way of using fractions. Because half is .5 or 1/2. I have no idea how he got 12 either!

Math  Erin, Wednesday, April 29, 2009 at 10:34pm
Thank you Ms. Sue!

Math  Ms. Sue, Wednesday, April 29, 2009 at 10:39pm
You're welcome, Erin!
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