ACE 2.4, Fact Families

LARGE GROUP
We shared our answers from the What are my Chances homework and the Problem of the Week, Rate Problems. Then we worked on Problem 2.4, Fact Families. By looking at simple fact families like 3 + 2 = 5, 2 + 3 = 5, 5-2 = 3 and 5-3 = 2, we can make similar fact families for problems involving negative numbers, allowing us to convert them into simpler problems to solve. We also used what we knew about the inverse relationship of addition and subtraction to solve for unknown variables in equations. Class notes may be downloaded here for class 7A and class 7B.

LARGE GROUP HW:
ACE 2.4 Homework
Please choose one of the options below to complete.

Option 1
Problems 17-19, 21-26 on pages 35-36

Option 2
Problems 18-19, 21-23, 25-26, and 41 on pages 35-40

Do not use a calculator!
Due tomorrow, Tuesday, March 23.

SMALL GROUPS
Students work with MaryBeth today. The shared homework ACE 2.3 and What are my Chances?

Then they reviewed their Addition and Subtraction of Integers Cards, and Fact Families. They discussed what is true about fact families: the numbers are exactly the same; they are made up of 2 addition and 2 subtraction facts; the addition facts are the same, but addends switched; you subtract each addend from the sum of the addition facts to find the subtraction facts.

Then students worked on Problem 2.4, Fact Families.

SMALL GROUP HW:
ACE 2.4
Problems 17 - 20, 22, 23a, 24-26 on pages 35-36.

Due tomorrow, Tuesday, March 23.