
Friday Ms. Martinez ordered pizza. The boys ate 2/5 of the pizza and the girls ate 1/2. Mike,
the boy on the right, in the green shirt, said, "We ate 3/7 of the whole pizza."
Do you see what Mike did? Is he right?



Let's Explore


This green is 2/5 of the pizza.
This green is also 2/5 of the pizza.
This orange is 1/2 of the pizza.
This orange is also 1/2 of the pizza.
Let's add both parts...
...and write the fraction of the pizza that the children ate together.
2
5 
+ 
1
2 
= 
4
10 
+ 
5
10 
= 
9
10 
= 
green and orange parts
total number of parts 
Something for You to Do


Directions:Use colored markers and the square grid paper to draw the fractions as we have above and add the following.
(a. 1/5)
(b. 2/5)
(c. 1/2)
(d. 3/4)
(e. 5/6)
(a. 1/5)
(b. 2/5)
(c. 1/2)
(d. 3/4)
(e. 5/6)
(a. 1/5)
(b. 2/5)
(c. 1/2)
(d. 3/4)
(e. 5/6)
(a. 1/5)
(b. 2/5)
(c. 1/2)
(d. 3/4)
(e. 5/6)
5. 
Challenge: Which of all the sums that you found above is the largest? 
(a. 1/5)
(b. 2/5)
(c. 1/2)
(d. 3/4)
(e. 5/6)
Was Mike correct? Is 2/5 + 1/2 = 3/7?