Adding & Subtracting Integers A Flashcards
-7 + 11 =
4
addition rule #2
4 + (-7) =
-3
addition rule #2
-8 + (-5) =
-13
addition rule #1
-9 - 7 =
-16
subtraction rule, addition rule #1
-9 + (-7) = -16
7 - 13 =
-6
subtraction rule, addition rule #2
7 + (-13) = -6
-12 - (-6) =
-6
subtraction rule, addition rule #2
-12 + 6 = -6
9 + (-8) =
1
addition rule #2
-14 - (-6) =
-8
subtraction rule, addition rule #2
-14 + 6 = -8
-4 + (-9) =
-13
addition rule #1
8 - (-9) =
17
subtraction rule, addition rule #1
8 + 9 = 17
-10 + 6 =
-4
addition rule #2
-5 + (-7) =
-12
addition rule #1
6 - 15 =
-9
subtraction rule, addition rule #2
6 + (-15) = -9
-2 + 12 =
10
addition rule #2
6 + (-5) =
1
addition rule #2
-3 - 7 =
-10
subtraction rule, addition rule #1
-3 + (-7) = -10
-8 + (-7) =
-15
addition rule #1
9 - (-2) =
11
subtraction rule, addition rule #1
9 + 2 = 11
8 - 9 =
-1
subtraction rule, addition rule #2
8 + (-9) = -1
16 - 7 =
9
subtraction rule, addition rule #2
16 + (-7) = 9
-5 - (-8) =
3
subtraction rule, addition rule #2
-5 + 8 = 3
-9 + (-8) =
-17
addition rule #1
When do you use addition rule #1?
Use addition rule #1 when you are adding numbers with the same sign.
Ex. 5 + 6 = 11 Or -5 + (-6) = -11
When do you use addition rule #2?
Use addition rule #2 when you are adding numbers with different signs.
Ex. -3 + 9 = 6 Or 3 + (-9) = -6
What do you change when using the subtraction rule?
Change the subtraction problem to addition and change the sign of the second number.
Ex. 1 Change 7 - 15 = to 7 + (-15) = -8
Ex. 2 Change -2 - (-10) = to -2 + 10 = 8
When using addition rule #2, what tells you the sign of the answer?
The sign of the answer will be the sign of the “bigger” number (more precisely, the number with the greater absolute value).
Ex. In the problem -8 + 5 = the answer will be negative because -8 has a greater absolute value than 5.
What do you get when you add any number to its opposite number?
Zero.
a + (-a) = 0 (where a is any number)
