Integer Addition
What is -7 + -2
-9
Write an equivalent addition problem for -7 - 5
(Add the opposite)
-7 + -5
When adding and subtracting decimals,
Do you need to line up the decimals?
Yes. Just not with multiplication
A helicopter is flying 55 feet above the ocean. Fish are swimming 17 feet below the surface.
What is the distance between the helicopter and the fish?
What is 72 feet.
What is -12 + -14
-26
What is (-7) - 5
(-7) - 5
= (-7) + (-5)
= -12
4/10 + 2/10
6/10
6/10 = 3/5
Ms. Julie deposited $45 in her bank account. She made a withdrawal of $23 and then deposited $15 more. What integer represents the new balance of her account?
10
What is -10 + 7
-3
What is (-4) - (-7)
-4 - (-7)
= -4 + 7
= 3
-1/4 + 3/4
= 2/4
2/4 = 1/2
4.8 + -2.7
4.8 + -2.7 = 2.1
What is 28 + -5
23
What is 12 - (-13)
12 - (-13)
= 12 + 13
= 25
-2/3 - (-1/6)
= -2/3 + 1/6
= -4/6 + 1/6 =
-3/6 = -1/2
-13.1 - (-11.4)
-13.1 - (-11.4) = -13.1 + 11.4
= -24.5
What is 100 + -28 + -2
70
What is -4 - 4 + -4
-12
-1 1/8 - (-4 3/4)
= -1 1/8 + 4 6/8
4 6/8 - 1 1/8 = 3 5/8
8.31 - 12.2
8.31 - 12.2 = 8.31 + -12.20
= 3.89