Word Problem:
Maria is planning a party and needs to buy balloons. She buys 27 red balloons and 18 blue balloons. How many more balloons does she need to reach her goal of having 72 balloons for the party?
Solution:
To find out how many more balloons Maria needs, we can use the given number sentence:
27 (red balloons) + 18 (blue balloons) + ? = 72 (total balloons)
First, we add the number of red and blue balloons:
27 + 18 = 45
Now, we need to find out how many more balloons are needed to make a total of 72. We can set up the equation as follows:
45 + ? = 72
To solve for the unknown, we subtract 45 from 72:
? = 72 - 45 ? = 27
Answer:
Maria needs 27 more balloons to reach her goal of 72 balloons.