Hi, I'm Andrea Roberts and I teach fourth grade at Bel Air Elementary School. Today, I'll be modeling
addition of fractions
using a number line.
Josseyln places 3/8 cups of strawberries and 4/8 cups of blueberries in a bowl.
How many total cups of berries did she use in all?
We'll start by writing our equation.
Because they're asking how many berries in all I know I will use addition to solve the problem.
First, I will draw a number line with the starting point of zero and an ending point of one.
Since the denominators are 8 I will partition the number line into eight equal parts and label each. I
make sure I label each with a fraction in order.
Because Josselyn started with 3/8 cups of strawberries
I will start at zero and I will move to the right three times and draw a point to represent that amount of
strawberries. I
will place a point.
Since Josselyn is adding 4/8 cups of blueberries into the bowl, I
will now move to the right four more times and place a point. I
have ended on 7/8 which is the total amount of berries.
Now, I will go back and finish writing my equation. 3/8 plus
4/8 equals 7/8 cups.
