Transcript Add and Subtract Integers - Broken Arrow Public Schools

Adding Integers
The Number Line
-5
0
5
Integers = {…, -2, -1, 0, 1, 2, …}
Addition Rule
1) When the signs are the same,
ADD and keep the sign.
(-2) + (-4) = -6
2) When the signs are different,
SUBTRACT and use the sign of the
larger number.
(-2) + 4 = 2
2 + (-4) = -2
Song
Addition Rule: Sung to the tune of “Row,
row, row, your boat”
Same signs add and keep,
different signs subtract,
keep the sign of the higher number,
then it will be exact!
Another way to Add Integers Is
With a Number Line
When the number is positive count
to the right.
When the number is negative count
to the left.
+
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
One Way to Add Integers Is With
a Number Line
3 + -5 =
-2
+
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
-
One Way to Add Integers Is With
a Number Line
-3 + 7 = +4
-
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
+
One Way to Add Integers Is With
a Number Line
-4 + -2 = -6
-
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
-
Examples: Use the number line if
necessary.
-5
0
1) (-4) + 8 =
4
2) (-1) + (-3) =
-4
3) 5 + (-7) =
-2
5
-1 + 3 = ?
1.
2.
3.
4.
-4
-2
2
4
Answer Now
-6 + (-3) = ?
1.
2.
3.
4.
-9
-3
3
9
Answer Now