From Whole Numbers to Rationals
First, we start with whole numbers, writing them over 1 to make fractions. Then we learn what that bottom number 1 means and what the top number, or numerator, means.
Fractions of All Sizes
We've looked at whole numbers as fractions. Now we'll see that we can model all kinds of fractions—fractions close to 0, fractions close to one half, and fractions close to 1.
Making Fractions Smaller and Larger
Increasing the top number, or numerator, without changing the denominator makes a fraction larger while decreasing it makes it smaller. The opposite is true for the bottom number, or denominator.