What is #3- 4.2 - (-2.2#)?

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Answer 1 · 2016-04-09T18:16:55

#3- 4.2 - (-2.2) = 1#

#3- 4.2 - (-2.2)# #" "# I would first get rid of the double negative

# = 3- 4.2 + 2.2#. #" "# Now do addition and subtraction from left to right.

# = -1.2 + 2.2 = 1#.

Note

Sometimes it is easier to add all the positive numbers, add all the negatives and then finish.

For example #5-2+8+3-7-4#.
The positives are #5+8+3 = 16# and
the negatives are: #-2-7-4 = -13#

So #5-2+8+3-7-4 = 16-13=3#.