Comparing different fractions to see which represents a larger or smaller amount.
Imagine you and a friend both have the exact same giant chocolate bar. You cut yours into 2 big pieces, but your friend cuts theirs into 10 tiny pieces. Who do you think has the bigger pieces?
In a fraction like , the bottom number is called the denominator. Think of the denominator as the 'Slicer.' It tells us how many equal pieces we cut the whole into. Here is the secret: the bigger the denominator, the smaller each piece becomes! If you share a pie with 2 people, you get a huge slice. If you share it with 100 people, you only get a tiny crumb. Even though 100 is a bigger number than 2, the fraction is much smaller than .
Let's compare and of a cake. 1. Look at the denominators: and . 2. Imagine cutting a cake into pieces. Those are big halves! 3. Imagine cutting the same cake into pieces. Those are small slices. 4. Since the pieces in the first cake are bigger, .
Quick Check
If you want the biggest piece of brownies possible, should you choose a piece that is or of the pan?
Answer
What happens when the denominators are the same? This is much easier! If the bottom numbers are the same, the pieces are all the same size. Now, we just look at the numerator (the top number). The numerator is the 'Counter.' It tells us how many pieces we actually have. If the pieces are the same size, having more pieces is always better. For example, is more than because pieces are more than piece.
Compare and using a symbol. 1. Check the denominators. Both are , so the slices are the same size. 2. Look at the numerators: and . 3. Since is greater than , we know that slices are more than slices. 4. Result: .
Quick Check
Which is larger: or ?
Answer
Sometimes, two fractions look different but represent the exact same amount. These are called equivalent fractions. Imagine a sandwich cut into halves. If you take half (), you have the same amount of food as someone who takes quarters () of the same sandwich. Even though the numbers are different, the total amount of 'stuff' is equal!
Is equivalent to ? 1. Imagine a rectangle colored in halfway: . 2. Now, take that same rectangle and divide it into equal parts total. 3. If you color of those parts, you will see it covers the exact same space as the section. 4. Therefore, .
Which symbol makes this statement true? ___
Which fraction is the largest?
True or False: is equivalent to .
Review Tomorrow
In 24 hours, try to explain to someone why is smaller than using the 'Pizza Rule.'
Practice Activity
Draw three circles. Shade in of the first, of the second, and of the third to see equivalent fractions in action!