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Mrs. Tammy Johnson
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Mrs. Johnson's Math Class Files & Links
Videos for Math
Prime, Composite, or Neither
Recognizing prime and composite numbers
: Can you recognize the prime numbers in this group of numbers? Which are prime, composite, or neither?
Khan Academy Comparing with Multiplication vs. Addition Word Problems
Comparing with multiplication: money and distance
: When comparing it's often helpful to start by using letters to represent numbers. Watch this video as we walk you through 2 examples involving money and distance.
Khan Academy Multiplying 2 digits by 2 digits with Distributive Property
Multiplying: 2 digits numbers (using distributive property)
: This is a fun way to solve this multiplication problem. Putting the distributive property to work! Cool.
Multiplying 2 digits by 2 digits using Area Model
Multiplying: using an area model
: Using graph paper we'll map out an area model to help us with a multiplication problem.
Multiplying 4 digits by 1 digit using grid or area model
Multiplying: 4 digits times 1 digit (using grid)
: It's helpful sometimes to use a grid when multiplying multi-digit numbers. Here's an example using a 4 digit number times a 1 digit number.
Multiplying 2 digits by 2 digits
Multiplying: 2 digit numbers
: The trick here to remember your place value as you multiply and then add the numbers. We'll demonstrate and make it perfectly clear!
Khan Academy Multiplying 4 digits by 1 digit
Multiplying: 4 digits times 1 digit (with carrying)
: This is getting fun! We're now multiplying FOUR digits times one digit. Remember to carry!
Khan Academy Video Subtracting and Regrouping Twice
Regrouping (borrowing) twice example
Subtracting Across Zero
Subtracting: Regrouping from zero
: In Kindergarten you learned the importance of sharing, right? In math, when we lack value in a number to subtract with you borrow or regroup from a neighbor. Sometimes you borrow from the tens...but what if you have zero tens? Ha....let's watch this and learn!
Khan Academy Adding with Regrouping
Adding: three digit numbers and regrouping
: In the old days 'regrouping' was known as "carrying." It's the same idea now as then: moving the tens (or hundreds or thousands) over to the next column.
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