Adding Rational Numbers
Solve:
a) 5+(−3) =
b) −7+ −12 =
a) 2
b) -19
Solve
a) 9−4
b) 6−9
a) 5
b) -3
Solve
-|-9|
-9
The temperature in Antartica started at 10°F and dropped by 7°F. What is the new temperature?
3°F
True or False:
–15 – 12 = -15 + -12 ?
True, using Keep Change Change the switches to addition
Solve:
a) 8.5 + (−2.5) =
b) (-9.2) + (-2.8) =
a) -11
b) -12
Solve
a) −6−3
b) −4−(−2)
a) -9
b) -2
Solve
|14-2|
12
Ms. Card went snorkeling over the summer in the ocean. If sea level is 0 ft and she swam 15 ft down below sea level and then went 8 ft more...what is her final sea level?
0 - 15 - 8 = -23
True or False:
The sum of two negative numbers is always negative.
True
Solve:
a) 7/8 + (-3/8)
b) -5/6 + 2/6
a) 4/8 or 1/2
b) -3/6 or -1/2
Solve
a) 12−(−5)
b) −10−(−15)
a) 17
b) 5
Solve
|-12+5|
7
The temperature was -4°F in the morning. By the afternoon, it warmed up by 9°F. What is the new temperature?
5°F
The sum of a positive number and a negative number is always negative.
False, your answer is positive or negative depending on which number in your expression is farther from zero!
Solve:
a) 3/4 + 2/3
b) 5/6 + -1/4
a) 17/12 or 1 5/12
b) 7/12
Solve
a) −7.5−(−2.5)
b) 3.5−(−4.2)
a) -5
b) 7.7
Solve
|-6| + -|3|
3
A submarine was 120 feet below sea level. It rose 45 feet, then dove down another 25 feet. Where is the submarine now?
-120 + 45 - 25 = -100
True or False?
–39.5 + (-7.2) = (-7.2) + (-39.5)
True, by Commutative property, no matter the order they still are equal!
Solve:
a) −4.2+7.9+(−3.7)
b) (-11/12) + 7/12 + 5/12
a) 0
b) 1/12
Solve
a) (-3/4) - 5/8
b) 7/8 - (-5/8)
a) -11/8 or -1 3/8
b) 12/8 or 3/2 or 1 1/2
Solve
|-4.5 - 7|
11.5
During the first quarter of a football game, a team lost 12 yards. In the second quarter, they gained 25 yards. In the third quarter, they lost 40 yards. What is their total yardage after three quarters?
-12+25-40 = -27
True or False:
45 – 83 = 83 – 45
False, Commutative Property is only true for addition!