1. Rational Numbers Essential Question: What do we need to do before we can add or subtract fractions? Unit 2 Day 4

2. Rational Numbers  Vocabulary:  Numerator:  Denominator:  Least common multiple (LCM):  Common denominator:  Least common denominator (LCD)  Reciprocal Number on top: part of the whole Number on bottom: the whole (Divisor) Is the smallest positive number that is dividable by both numbers Same denominator LCM of the denominators of a set of fractions multiplicative inverse: flip the fraction

3. Fractions must have a common denominator in order to add or subtract them.

4. Add or Subtract Fractions with common denominators: = 6 = -2

5. Practice:

6. Summary:  In one sentence: write down what do we need to do before we can add or subtract fractions?