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

the class that these pairs of numbers are equal by the commutativeproperty of addition. Next I will remove one chip from the yellowtray and one chip from the red tray. Again reminding the class thatthese two chips together make a zero pair and removing zero pairswill not change the value of our sentence. I will continueremoving zero pairs until one of the trays is empty. Last I wouldwrite what I see on the board -3 + 5 = 2, because there will be 2chips left in the yellow pan on the right side of the balance.• I will write 3 + 1 on the board and model in the same fashion asabove. This time I would not have to remove zero pairs becausethere are not any chips in both pans to make zero pairs. I wouldjust have 4 chips in the yellow pan making the sentence to be3 + 1 = 4• I will write -2 + -4 on the board and model in the same fashion asabove. This time I would not have to remove any zero pairsbecause there are not any chips in both pans to make a zero pair. Iwould just have 6 chips in the red pan, making the sentence to be-2 + -4 = -6.4. In small groups have students complete Unit 3 Practice from pg 50 in TheFour-Pan Algebra Balance.Closure:• In journals have students answer the question on the bottom of page 50, "Look forpatterns in your practice problems. Use them to write rules for adding integerswithout the help of the balance."Homework:• Write a paragraph on why you like the algebra-pan balance for adding integers orwhy you disliked it. Please write about any confusion that you may have hadusing the balance or why this helped you learn.Student Handouts:• None10