Adding and Subtracting Integers Unit Grade 7 Math 5 Days Tools ...

Lesson: Day Three-Adding integers using algebra tilesTime: 45 minutesObjectives:• Students will be able to add positive integers together.• Students will be able to add negative integers together.• Students will be able to define the additive inverse and apply it in adding integerstogether and finding zero pairs.• Students will be able to define zero principle and apply it to solve integer additionproblems.• Students will be able to define the commutative property of addition and use it tosolve problems.• Students will be able to add positive integers to negative integersMaterials:• Class set of Algebra tiles• Class set of Algebra tile mats (I use a piece of construction paper laid horizontallywith one line down the middle)• Overhead algebra tiles• Adding integers using algebra tiles—worksheet• Red and green colored markers, crayons, ect.• Chart paper and markers.Activities:1. On the board will be the following problem of the Day, for the students tocomplete as they sit down (5 min).• An underwater diver is at 8 feet below sea level and he descends 5more feet. Where is the diver located now?• We will go over the Problem of the Day by drawing a picture orusing the rules on chart paper, from last class.2. Pass out algebra tiles and mats to each student. Explain the red ones arenegative integers and the other colored ones are positive integers, (mypositive integers are green). Explain to the class that today we are onlyusing the integer tile, the small square of both colors.3. Ask the class how they would make a zero pair using algebra tiles(answer: one green tile and one red tile of the same size.)4. Pass out Handout tiled Adding integers using algebra tiles (see attached).5. I will model how to do question #1 from worksheet, using overheadalgebra tiles.• Place 3 green integers on the left side of the mat (keep them in agroup of 3), then add 4 more green integers on the left side of themat (keep them in a group of four). Now on the right side of themat add 3 green integers and 4 green integers, but this time I willpush my integers together. Now count how many integers we haveon the right side of the mat, altogether. Therefore 3 + 4 = 7. Ask11