Number Sense - Elementary School Math

There were 35 pizzas at Andrew’s birthday party and 16 of them had only pepperoni topping while the rest had a mushroom topping. How many pizza had the mushroom topping?

a. 12
b. 19
c. 21
d. 8

Answer:  (b)  19 pizzass had only a mushroom topping.

The student needs to recognize number sense and know how to add, subtract, multiply and divide mathematical expressions.

In order to solve this problem, it is important to realize that the total number of pizza’s were 35 and since 16 had only pepperoni that means that the student must subtract 16 from the total of 35 to obtain the number of pizza’s with the mushroom topping.

35 – 16 = 19 pizzas with a mushroom topping.

©Copyright 2008.Najwa S. Hirn. All rights reserved.

Fractional Expressions - College Level Math

Multiply the following fractional expression and simplify:

Answer:

In order to solve this problem, we first must factor the numerator and denominator of each fraction. Once they are factored the problem will look like the following:

Now it is time to multiply the numerators and multiply the denominators as follows:

It is obvious from the above that several factors can be cancelled. It is noted that the(a-1) factors can be cancelled from both numerator and denominator and one (a +4) can be cancelled from the numerator. The final simplified answer will look as follows:

© Copyrightreserved 2008.Najwa S. Hirn. All rights