Unit 3 Math Review

• I can review strategies and skills taught in unit 3.

• I can apply strategies I learned to addition and subtraction problems.

• I can demonstrate my learning by completing some practice problems.

• Look at the input and output numbers.

• Check to see what rule the numbers follow.

• Make sure to think about your different operations: addition, subtraction, division and multiplication.

• The rule MUST apply to all numbers

Function Machines: Input and Output

• Find closer but easier numbers by rounding your numbers in the original problem.

• Round to the nearest 10 or 100.

• Look to see what operation the problem is having you do.

• Find the estimated sum or difference.

Rounding Numbers and Estimating

Partial Sums

Column Addition

Counting-Up Subtraction

Expand-and-Trade Subtraction

Multiplication Square Facts

Commutative Property of Multiplication

• Both factors are the same.

• The array created is a square.

• The factors are flipped.

• The product is the same.

• The array created is flipped over.

Adding a Group

Subtracting a Group

• Start with a helper fact.

• Add a group or two to figure out the product of the unknown fact.

• Helper Fact: 5 x 7= 35

• Unknown Fact: 6 x 7 = ?

• Start with a helper fact.

• Add a group or two to figure out the product of the unknown fact.

• Helper fact: 10 x 4 = 40

• Unknown Fact: 9 x 4 = ?

Name Collection Boxes

• Write in expressions that total the number given.

• Write down words, pictures or number models that fit.