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April 20, 2014

April 20, 2014

Posted by **Tessa** on Sunday, March 15, 2009 at 7:58pm.

8-(-2/3)+7-(1 2/3)+5=

(-3)-2.2-9-(-12)=

-2/7-2 3/5+1 2/7-(-2/5)=

If you just explain one of the problems, that's awesome! you don't have to do all three. Sorry if it's a lot but it's different areas I'm having trouble with. Thanks a million! :)

- Math -
**Ms. Sue**, Sunday, March 15, 2009 at 8:11pmI worked this in two different orders to make sure I was right.

8-(-2/3)+7-(1 2/3)+5=

8 + 2/3 + 7 - 1 2/3 + 5 =

15 + 5 - 1 = 19

8 2/3 + 5 1/3 + 5 = 19

- Math -
**GanonTEK**, Sunday, March 15, 2009 at 8:15pmOk, I'll do the 1st one;

first of all 8 - (-2/3)

well, minus times minus = plus

[e.g. -4*-4 = 16]

so that becomes 8 + 2/3

Now we need to do the same with the rest of the equation to get

8 + 2/3 + 7 - 1 2/3 + 5

You how have to sort out 1 2/3 which is 1 and 2/3 which equals 5/3

So now we have 8 + 2/3 + 7 - 5/3 + 5

Now we add the fractions together and the whole numbers together separately to get

(8 + 7 + 5) + (2/3 - 5/3)

which becomes

(20) + (-3/3)

which becomes

20 - 1 = 19

So 19 is the answer.

I hope that helps

- Math -
**jesse**, Sunday, March 15, 2009 at 8:15pmyou have to remember that when you subtract a negative, you really add it - the () were used in your problems to section off numbers

8-(-2/3) would be the same as 8 + 2/3

- Math -
**jesse**, Sunday, March 15, 2009 at 8:40pmjust in case you're still stuck on the 2nd & 3rd ones - one more thing to remember: when you add/subtract fractions, they need common denominators

#2) (-3)-2.2-9-(-12)=

(-3) - 2.2 = -5.2 - 9 - (-12)

-5.2 -9 = -14.2 -(-12)

*remember the -(-12) is really adding

-14.2 + 12 = -2.2

- Math -
**jesse**, Sunday, March 15, 2009 at 8:46pm#3) - this one needs common demoninators

-2/7-2 3/5+1 2/7-(-2/5)=

-2/7 will become -10/35

2 3/5 will become 2 21/35

1 2/7 will become 1 10/35

-10/35 - 2 21/35 = -2 31/35

-2 31/35 + 1 10/35 is really subtracting and keeping the sign from the higher number (negative here)

= -1 21/35 -(-2/5) *you'll need to have common denominators here too - it might be easier to go back to the 5ths

-1 21/35 becomes -1 3/5

-1 3/5 - (-2/5) =

-1 3/5 + 2/5 =

-1 1/5 is your answer

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