Rules and Vocabulary
When both numbers have the same sign, you __________ the numbers together and your answer has that sign.
Add
1+15 =
16
(-0.5)+0.3 =
-0.2
5/4 - 3/4 =
*can also be written as 5/4 + (-3/4)
2/4 or 1/2
What is the result of -3 + 7?
4
What is the term for two numbers whose sum is zero? (ex. 9 - 9 = 9 + (-9) = 0)
Zero Pair
19-(-2) =
21
9.8-7.1 =
2.7
2/5 + 4/5 =
6/5 or 1 1/5
What is the term for any number in the set of numbers (ex. -3, -2, -1, 0, 1, 2, 3), numbers and their opposites?
Integer
When the numbers have different signs, you __________ the numbers and the sign for your answer is whichever value you had more of initially.
Subtract
(-4)+(-18)=
-22
(-4.79)+(-0.4) =
-5.19
1/3 - 2/3 =
*can also be written as 1/3 + (-2/3)
-1/3
What is 3.2 - 1.7?
1.5
What is the term for the opposite of a number? (ex. 9 and -9)
Additive Inverse
5-14 =
-9
(-7.1)+3.63 =
-3.47
(-1/3) + 3/8 =
1/24
When adding or subtracting decimals, make sure to line up the ____________.
Decimal Points
When you have two negative signs or subtraction signs beside each other (ex. 5-(-3), those signs turn into _____________.
One Positive
(-6)-(-17) =
11
(-18.278)-(-6.8) =
-11.478
9/5 - 4/3 =
*can also be written as 9/5 + (-4/3)
7/15
Which integer is the sum of -6 and -4?
-10