# Math

posted by .

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 -

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 -

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 -

30 / 1/2 = 30 * 2 = 60

60 + 10 = 70

You are right!!! :-)

• Math -

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 -

Thank you Ms. Sue!

• Math -

You're welcome, Erin!

## Similar Questions

1. ### Peer review

How would you encourage a reluctant peer reviewer?
2. ### math

kelly solved the following problem on her recent math test 121/11+4*8=120 the answer was marked wrong by your teacher and kelly is asking you to explain why she missed the promblem.whicthsolutions would you tell her A.divide 121 by …
3. ### maths

i think of a number and divide it by 25 and then add 6 . the answer is 18 . whatnumber did i think of ?
4. ### math

I have a couple of math questions that i cant seem to get to work out. can someone help me please.?
5. ### math

The initial amount is 1 million. Divide it by 4. Divide the result by 5. Divide the result by 2. Divide the result by 20. Subtract 50. Divide by 3 then by 8. Subtract 1. Divide the result by 7. Add 2. Divide by 3. Add 2. Lastly, divide …
6. ### math

a fair coin is tossed in the air 4 times. if the coin lands heads up the first three tosses, what is the probability the coin will land heads up the fourth toss?
7. ### math

1 2/3 add 2 8/9 then divide the answer by 3. 1 2/3 add 2 8/9= 7/3 add 26/9= 21/9 add 26/9=47/9 I got that bit I just don't know how to divide
8. ### Math

Help, Divide 50 by half, and add 20. I do not understand.
9. ### Math2

Paula has a mathematical magic trick. She gives the following instructions to her friend Jessica: -think of a number - triple it - add 6 - divide by 3 - add 5 - subtract your original number Paula now knows the number Jessica ended …
10. ### math

think of a number. Triple it. Add 100. double the result. Add 100. divide the result by 4. subtract one a half time the original number. What is the result?

More Similar Questions