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Concepts
Adding Negative and Positive Decimals
Subtracting Negative and Positive Decimals
MORE Adding Negative and Positive Decimals
MORE Subtracting Negative and Positive Decimals
100
What is Step One to Adding and Subtracting Decimals?
Align (line up) the Decimals
100
4.56 + (-5.89)
-1.33
100
-6.25 - 4.32
-10.57
100
-23.32 + -24.01 =
-47.33
100
-12.34 - (-56.43) =
44.09
200
What is the FIRST thing you should do with a subtraction problem involving positives and negatives?
Change the subtraction to adding the opposite. (Change, Change)
200
-2.81 + (-1.45)
-4.26
200
89.32 - (-76.50)
165.82
200
-10.32 + -23.76 =
-34.08
200
-23.64 - (-34.32) =
10.68
300
When You Subtract Decimals you?
Add The Opposite
300
3.1475 + 6.39
9.5375
300
-23.564 - 21.397
-44.961
300
-49.32 + 34.54 =
-14.78
300
-45.98 - 2.43 =
-48.41
400
When can you ask "Battle or Party?"
When it is an addition problem
400
-15.6 + 4.978
-10.622
400
-9.68 - (-7.2534)
-2.4266
400
-13.56 + 516 =
502.44
400
-253.03 - (-7.651) =
-245.379
500
When should you NOT use "Change, Change"?
When it already an addition problem.
500
-16.1 + 3207.87
3191.77
500
32.298014 - 74.652
-42.353986
500
45.52015 - 49.5=
-3.97985
500
45.5 - (-2354.78) =
2400.28