When
Dino invites people over for pizza, he never bothers to count the number
of people before he cuts the pizza. He always cuts it into 10 slices.
Once he cuts it, he divides the 10 slices evenly among the guests.
When
Dino invites people over for pizza, he never bothers to count the number
of people before he cuts the pizza. He always cuts it into 10 slices.
Once he cuts it, he divides the 10 slices evenly among the guests.
If he has five guests, each guest gets 2 slices. Dino expresses this number as 0.2 pizzas. The zero represents the number of whole pizzas that each guest ate.
Since nobody ate a whole pizza by themselves, there is a zero to the left of the decimal point. The number 2, which is the first number to the right of the decimal point represents the amount of slices of pizza each person ate. The number 0.2 is called two tenths, since there were 10 slices in the whole pizza and each person got 2.
If Dino had eaten a whole pizza before the guests got
there and then 2 slices once they were there. If you think about
it, he would have eaten more than one pizza, but less than two. Using
decimals we say he would have eaten 1.2
(or one and two tenths) pizzas total.
Dino's job gets a little more challenging if there he has 4 people for pizza. After he divides the 10 slices up, each guest gets 2 slices or 0.2, but he ends up with two left over.
Instead of giving two people a third slice, Dino cuts each of the slices into 10 bite-size pieces. Since he had 2 slices that he cut into 10, he ended up with 20 bite-size pieces.
He divides the 20 bite size pieces among the four guests, and each guest gets 5.
When there are 4 guests, each one gets 0.25 of a pizza. The 2 still represents the numer of the original 10 slices that each guest got. The five represents the number of bite-size pieces that each guest got.
This number 0.25 (which can be thought of as two tenths and five hundreths) is called twenty-five hundreths.
Since there are originally 10 slices in the pizza, if Dino were to cut all of the slices into bite-size slices there would be 100 bite-size slices in the whole pizza. Each person got 2 slices (which is equal to 20 bite-size pieces) and then five bite-size pieces for a total of 25 bite-size pieces, or twenty-five hundreths, or 0.25
Click
here to see some example of how Dino cuts up pizza
Decimal
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