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# 1 1 decimals for whole numbers 9-9-10

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### 1 1 decimals for whole numbers 9-9-10

1. 1. Chapter 1 Decimal Notation<br />What are some other ways you have seen the numbers 1-9 written?<br />Greek<br />α β γ δ ε ς ζ η φ<br />Roman<br />I II III IV V VI VII VIII IX<br />Chinese (ancient)<br />Chinese (modern)<br />What letter did the Romans use to stand for the number of fingers on one normal hand?<br />
2. 2. The beginnings of our number system was developed by the Mayas of Central America in 300 B.C. and have developed over the years. When do you think the ten digits we use today started to look like this: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9?<br />1522 A.D.<br />These numerals used by mathematicians throughout the world are called <br />Arabic <br />or <br />Hindu-Arabic numerals.<br />
3. 3. 1-1 Decimals for Whole Numbers<br />The Taste of Chicago draws big crowds who sample foods from Chicago's numerous ethnic restaurants. The year 2000 attendance over 10 days was almost 3,700,000, about the same as the population of Puerto Rico.<br />What is the decimal system?<br />- a system of writing numbers based on the number 10.<br />- numbers from this system are said to be in decimal notation<br />- the smallest 10 numbers need only one digit:<br />0 1 2 3 4 5 6 7 8 9<br />What is the smallest whole number?<br />**The whole numbers are called decimals even though there are no decimal points!**<br />INTERESTING!<br />Can you read this number? 3700000<br />Look at the number above for the Taste of Chicago.<br />Add commas to group digits and make them easier to read:<br /> 3,700,000<br />In Europe, the decimal numeral for seven is sometimes written as shown. Why do you think this is done?<br />
4. 4. Objective: Translate back and forth from English into the decimal system.<br />To write a number using Decimal Notation is shorter than writing a number using English words.<br />The smallest ten whole numbers have just one digit.<br />Then, 2 digits are needed to write the next ninety whole numbers from 10 - 99.<br />How many whole numbers have 3 digits?<br />Name the digit in the indicated place of the number 568,249.<br />thousands<br />ones<br />hundreds<br />tens<br />A number is written as a decimal. Must there be a decimal point? Example?<br />
5. 5. Your Turn!<br />Name the digit in each place of the given number.<br />P1. <br />
6. 6. English to Decimal Notation Examples<br />
7. 7. Decimal Notation to English Examples<br />
8. 8. Counts & Counting Units<br />The U.S. population is an example of a count- the most basic use of numbers.<br />For example, in gym, you count off by 4's to form teams. In class, I count the number of students in Math 7 period 3. We count the number of students in 7th grade or in middle school. <br />A count is just a whole number.<br />Why is a count a whole number, not a decimal, fraction, or negative number?<br />For every count, there is a counting unit to explain what has been counted. <br />For example:<br />The count for students in Math 7 is 19. <br />The count is 19.<br />The counting unit is Math 7 students.<br />
9. 9. Counts & Counting Units Examples<br />What is the count and counting unit for each phrase?<br />CountCounting Unit<br />10. 0 eight-legged insects<br />11. 34 letters in "supercalifragilisticexpialidocious"<br />12. U.S. population of 248,709,873<br />
10. 10. tonight's Homework/Practice<br />Textbook pages 8-9 #15, 19-23all<br />Please complete your homework in your notebook, continuing after today's notes.<br />