Adding and Subtracting Rational Expressions

Adding and Subtraction Rational Expressions

Open Ended

Based on yesterday's lesson...what should happen next?

Let's check in from Multiplying and Dividing Rational Expressions

Poll

When we add or subtract and rational expression we need...

• common denominators

• LCM between denominators

• to combine only the numerators

• simplify

Open Ended

What do you need to have or do in order to add or subtract rational expressions?

What process do we need to take to add or subtract rational expressions? Let's see!

• We need a common denominator (the LCM between the two)

• We need to make sure that WHATEVER we multiplied the denominator by we MUST multiply the numerator by.

• We ONLY add or subtract the numerators once we have common denominators

Fill in the Blanks

We need a

denominator in order to add or subtract rational expressions.

Multiple Choice

The denomiator should be the... between the two denominatrs.

• Least Common Numerator

• Least Common Answer

• Least Common Multiple

• Least Common Path

Let's look at a worked example.

Multiple Choice

What is happening in this step?

• Combining like terms/Simplifying if we can.

• Writing both expressions from the numerators in the same numerator.

• Multiplying each numerator by the corresponding denominator.

• Finding the Common Denominator by determine the least common multiple.

Multiple Choice

What's happening in this step?

• Finding the Common Denominator by determine the least common multiple.

• Each numerator has been multiplied by the corresponding denominator.

• Combining like terms/Simplifying if we can.

• Distributing the negative, so we can combine like terms.

Multiple Choice

What should have happened JUST before in this step?

• Writing both expressions from the numerators in the same numerator.

• Finding the Common Denominator by determine the least common multiple.

• Distributing the negative, so we can combine like terms.

• Distributing the negative, so we can combine like terms.

Poll

Based on what I've seen I now know about....a little bit better.

• Common Denominators

• Distributing the Negative

• Only Combining the Numerators

• I already knew this! I'm a champ!