Transcript Subtracting Integers

Subtracting Integers
I Love Numbers!!!
Quick Review of
Adding Integers
• Adding Rule #1
– If the signs are the same,
add as you normally do.
– Keep the same sign.
• 5 + 8 = 13
• -8 + -17 = -25
• Adding Rule #2
– If the signs are
DIFFERENT, pretend the
signs aren’t there.
– Subtract the smaller
from the larger one.
– Keep the sign of the
number with the
GREATEST Absolute
Value.
• 19 + -11 = 8
• 24 + -86 = -62
3 Steps to
Subtract Integers
• Keep
– Keep the 1st number
• Change
– Subtraction sign to Addition
• Opposite
– Write down the opposite of the 2nd number
• Then add the way you normally do.
-9 – 14 =
Keep
Change
Opposite
-9 - - 14 = -23
Now follow the adding integers rules.
Practice…
1. -7 – 15 = -22
2. 23 – 98 =
-75
3. -48 - -13 =
-35
4. 5 - -6 =
11
5. 17 – 8 =
9