MATH NETDECIMAL NUMBERS

SOFIA LOZANO

MARIA JOSE LAVERDE

LAURA JIMENEZ

GABRIELA CARDOZO.

DECIMAL NUMBERS DEFINITION.

The word "Decimal" means "based on 10" (From Latin decima: a tenth part).

"Decimal Number" usually means there is a Decimal Point.

DECIMAL POINTThe decimal point is the most important part of a Decimal Number. It is exactly to the right of the Units position. Without it, we would be lost ... and not know what each position meant.

The number to the left of the decimal point is a whole number and is 10x bigger.

The number to the right of the decimal point is 10 times smaller and is a decimal number. As we move further right, every number place gets 10x smaller.

OTHER DECIMAL NUMBERS DEFINITIONS.

A linear array of digits that represents a real number, every decimal place indicating a multiple of a negative power of 10.

For example, the decimal 0.1 = 1/10 , 0.12 = 12/100 , 0.003 = 3/1000 .

A DECIMAL NUMBER IS ALSO CALLED DECIMAL FRACTION:

A Decimal Fraction is a fraction where the denominator (the bottom number) is a number such as 10, 100, 1000, etc. (in other words a power of ten) , the power depending on or deciding the decimal place.

For example: the decimal 0.1 = 1/10 ,

0.12 = 12/100 ,

0.003 = 3/1000 .

QUESTIONS ABOUT DECIMALS

•IS DIFFERENT 0.3- 0.03?• ANSWEAR: yes, because 0.03 is 10 times smaller than 0.3.

QUESTIONS ABOUT DECIMALS Why 0.8 is bigger than 0.50? Answer: First, you have to know that 0.50 = 0.5 . Then, 0.8 is bigger than 0.5 because 0.8 = 8/10 or 8

parts of ten equal parts and 0.5 = 5/10 or 5 parts of

ten equal parts so 8 is greater than 5.

WRITING DECIMAL NUMBERS

PROBLEM: write a decimal and a fraction in simplest form for the part that is black.

Fraction : 12

100

Decimal: 0.12

DECIMAL IN DÓLLAR

1 cent = to 0.01

25 cents = 0.25

50 cents = 0.50

5 cents = 0.05 5 dollars = 5.00

10 cents = 0.10

1 dollar = 1.00

PROBLEMLina have to pay 43 dollars to buy her toy and she have 100 dollars.

a. write this in a fraction and in decimal form.

b. How much money does she have left?

c. Can she buy with the money left another toy that cost 64.50 dollars?

ANSWERS! a. 43/100 = 0.43

b. 100 – 43 = 57 . She had left 57 dollars.

c. No she can’t buy the other toy because she

needs 7.5 dollars more.

USE OFDECIMAL NUMBERS

To know about decimal numbers is important because in daily life we have to use likemoney to buy things, in school for science and math to find volume, weight, etc. and to find the distance between two places.

DECIMAL NUMBERS AND DOLLARS PROBLEM: I want to buy a candy bar for $0.75.

If I buy 4 candy bars, how much money will I spend?

STRATEGY: Multiplication

PROCESS: $0.75 x 4 ----------- $3.00

ANSWER: I will spend $ 3.00 dollars.

USE OF DECIMAL NUMBERS

PROBLEM: In my neighborhood are 1,000 apartments and only 50 of them have balcony. How can you write this information in fraction and decimal numbers?

ANSWER:• Fraction: 50 1000

• Decimals: 0.005

USE OF DECIMAL NUMBERS

PROBLEM: Mateo has with his name 4 colors of 100.

How can you write this information in fractions and in decimals?

ANSWER:o Fraction: 4

100

o Decimal: 0.04

USE OF DECIMAL NUMBERS The radio tower is 4.2 kilometers east of the

bakery. The gift shop is 14.2 kilometers east of the bakery.

Which is closer to the radio tower, the gift shop or the bakery?

a. gift shop b. bakery

USE OF DECIMAL NUMBERS In chemistry

laboratory we can measure measuring water volume using both a ruler and a graduated cylinder.

In this image the volume of water is 70.3 ml.

USE OF DECIMAL NUMBERS During science laboratory we can study various

physical properties of matter. Example: we can measure mass using a pan

balance to find the mass of a linking cube. Mass could be of 3.6 grams.

BIBLIOGRAPHY http://www.mathsisfun.com/decimals.htm http://www.google.com/imgres?imgurl http://www.kidsmathblog.com/wpcontent/

uploads http://www.tutornext.com/help/decimals-

tenths-hundredths http://4cornerscce.blogspot.com/

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