Adding integers -same sign
4+4=
8
10+8=
18
9+(-3)=
6
-19+(20)=
1
Elvin is going bowling with his friends. He asked his mom to borrow 15 dollars. The next day he found 3 dollars in his backpack and gave it to his mom. How much does he still owe?
He still owes -12 dollars.
A positive plus a positive equals
positive
-13+(-10)=
-23
-32+(-8)=
What is -40?
What is the rule of adding integers with different signs?
Subtract the numbers and take the sign of the bigger number.
What number can be added to -30 to have a sum of zero?
What is 30?
A football team gains 9 yards in one play, then loses 4 yards in the next. What is the team’s total yardage for the two plays?
5 yards
What does sum mean? what does difference mean?
Addition/Subtraction
-9+(-10)=
-19
-76+(-3)=
What is -79?
-14+(4)=
-10
-340+(10)=
-330
A submarine submerged at a depth of −40 feet dives 57 feet more. What is the new depth of the submarine?
-97
A negative plus a negative equals?
Negative
-32+(-11)=
-43
-90+(-16)=
-106
18+(-10)=
8
10 + (-500)=
-490
Matt is playing a game. He gains 7 points, loses 10 points, gains 2 points. What is his score?
-1 Point
True or false? A negative plus a positive is always negative. Give an example to support your response.
False. Possible example: -6+15=9
True or false? -22+23 a zero pair? Explain.
False. A zero pair would be -22+22 or -23+23. to create a zero pair you must add a number and its opposite.
The absolute value of - 11
What is 11?
10+(-5)=
5
-343+13=
-330
Karen deposited $25 in the bank on Monday and $50 on Wednesday. On Saturday, she withdrew $40. What was the total change in her bank account?
$35
What does it mean to find the absolute value?
The distance from a number to zero.