1-3 Adding and Subtracting Integers Aim: How can we add and subtract integers and to solve problems involving integers? CCSS: 7.NS.1.d

Warm up: Quiz 1 (15 Min) Write an algebraic expression for each phrase 1. The product of -3 and a number s 2. A number v divided by The quotient of a number m and The sum of 4 and a number f Simplify each expression. 1. |-304| 2. |15| 3. 2 |8| |-3| Evaluate each expression for the given values. 1. 3|c| for c = |f g| for f = 4, g = 7 3. |x| + y for x = -4.2, and y =3 4. A mechanic charges $ 168 per parts and $35 per hour for labor. Write an expression for the total charge. Evaluate the expression to find the total charge for 3 hours of labor

Adding/Subtracting Integers Simplify: (-15) = = – (-15) = – 12 = A football team’s movement on the field: If a team loses 9 yards and then gains 9 yards, it is back where it started: What happen??? = 0 Two numbers whose sum is 0 are additive inverses.

Geography A group of archaeologists leaves a site in Jordan and descends 647 m to the shore of the Dead Sea. Their initial elevation was 251 m above sea level. What is the elevation of the Dead Sea?

Partner Work Vocabulary: How are whole numbers different from integers? Mental Math. Determine whether each expression equals a positive or a negative number (-6) (-4) Simplify each expression = = = 4. 4 – 1 = (-3) = – 4 = Evaluate x + y – z for x =2, y = -2, and z =-3 Challenge: For what integer values x is | x + 1| -2 positive? Think, Pair, Share

Exit Ticket “ A Game” 1. Write two integers. 2. Exchange papers with partners who add the integers. 3. Then subtract the first integer from the second.