When combine integers that have the same signs

1
When combine integers that have the same signs

• ADD and keep the same sign.

2
Examples

• 2 5
• 9 2
• - 2 (-3)
• - 5 (-5)

3
When combine integers that have the different
signs

• SUBTRACT and keep the sign of the bigger number.

4
Examples

• -2 5
• -9 2
• 2 (-3)
• 5 (-5)

5
SUBTRATING integers is the same thing as adding
its opposites.

• The opposite of a positive number is a negative
  number.
• The opposite of a negative number is a positive
  number.

6
Examples

• 4 - 5
• 3 - 2
• 2 - (-3)
• - 9 - (-5)

7
One day this winter Indianapolis, Indiana had a
low temperature of -28 degrees. On this day the
temperature steadily rose 4 degrees every hour
for seven hours. What temperature did it hold at?
8
Farmer Teds pond has been low this summer. On
Monday it was 38 inches below sea level. It did
not rain for two more days, and each of those
days the water level went down 4 more
inches. What was the water level after those two
days?
9
Dominic Davis rushed for 250 yards the entire
2005 football season. In the first four games of
the 2006 football season he rushed for a total of
-35 yards. How many yards does he need to gain to
equal the previous years yardage?
10
Jerry and Sherry share a checking account. The
current balance is 684.65. Jerry wrote a check
for 202.30 to purchase a new barbecue pit. Jerry
forgot to write down the check he wrote in the
check register. Sherry wrote a check for 250.35
for the electric bill, and 365 for the car
payment. What is the new account balance?