Rules
When adding two of the same sign, you should...
keep that sign!
(-5) + (-2)
-7
(-2.7) - 3.88
-6.58
(-1/6) + 8/6
1 1/6 (1 and 1/6)
-5 + -5 is 0 because the -5's subtract and cancel each other out.
ADD because of same signs. Answer is -10.
When working with different signs,
subtract!
(-30) + 12
-18
54 - 99.33
-45.33
2 2/4 - 5 (2 and 2/4 minus 5)
- 2 1/2 (negative two and one half)
The mixed number 4 2/5 (4 and 2/5) becomes 13/5. 4 times 2 is 8, plus the 5 from the denominator to make 13/5.
Multiply the denominator and whole number first, not the numerator and whole number.
Which number has the larger absolute value
48 - (-56)
104
-841.22 + 9.377
-831.843
4 1/3 - 2 7/10
1 19/30
If I take one hundred positive numbers and one negative number and add them together, the final sum will be a positive number because there were more positive numbers than negative numbers.
That's not necessarily true. How "big" was the negative number? (Imagine the number 1 100 times versus -1,000,000)