Mary needs to order pizza for 18 students. each student should get 1/4 of the pizza. how much pizza will be left over?

Step-by-step explanation:

Order 5 pizza's. There is  

1

2

a pizza left so someone gets an extra portion! Or it is split evenly!

Explanation:

No matter how you present this, the underlying principle is that of ratio.

If each pupil gets  

1

4

of a pizza the 1 pizza feeds 4 students.

So the ratio of  

pizza count

Student count

→

1

4

Need to have sufficient pizza for 18 students. The ratio will be constant so we have:

Let the count of pizzas be  

p

pizza count

Student count

=

1

4

=

p

18

So we now have:

p

18

=

1

4

Multiply both sides by  

18

giving:

18

×

p

18

=

1

4

×

18

18

18

×

p

=

18

4

But  

18

18

=

1

p

=

18

4

=

4

1

2

You can not order  

1

2

a pizza so the total pizza count is 5

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step-by-step explanation: