ACE 2.2 Introduction to subtraction of Integers

LARGE GROUP
After a warm-up to review absolute value and opposites, we went over the last part of problem 2.1. We found that the Commutative Law of Addition says that the order of the addends in an addition problem doesn't matter: the sum is the same. We can use the Commutative Law of Addition with rational numbers (positive and negative integers and fractions) to make addition problems easier for us; for example, in some cases it may be easier to have a negative number first or second, if they are not the same sign.

Then we worked on problem 2.2, Introduction to subtraction of integers. Students found it much more challenging to write down algorithms for all the different cases in subtraction. We will talk more about this tomorrow. Class notes for may be downloaded here for class 7A and class 7B.

LARGE GROUP HW:
ACE 2.2 Homework
Please choose one of the options below to complete.

Option 1
Problems 4-7 on page 33

Option 2
Problems 6-7 and 38-39 on pages 33-39

Do not use a calculator!
Due tomorrow, Wednesday, March 17.

SMALL GROUPS
Today students reviewed Problem 1.4 with Cory, and worked on Problem 2.1, Introducing Addition of Integers. They created cards for the addition algorithm and the Commutative Property.

SMALL GROUP HW:
Finish Problem 2.1 on page 24
ACE 2.1 Homework
Problems 4-7 on page 33

NO CALCULATORS!!
Due tomorrow, Wednesday, March 17.