Lesson Plan - Get It!
The State of Liberty is just over one hundred eleven feet tall. How do you write that number in numerical form?
When you learned to count, you most likely learned to start counting with zero and then one, two, three, and so on.
These are called counting numbers.
The place value of the digits in a number helps you name the number in written form or write it using numerical form. A number in written form is spelled out in words. A number in numerical form is written using digits.
First, let’s review place value and what the digits in each place represent. As you watch the video Math Antics - Place Value, answer these questions:
- What is the pattern as place value spots get bigger, such as ones, tens, hundreds, thousands?
- If a 9 is in the hundreds place, what value does it have?
If you can name the following numbers in the chart below, you can put them together to write numbers up to 1,000. In order to write the names of numbers through 1,000, you need to know how to say and write the following numbers:
0 - zero
1 - one
2 - two
3 - three
4 - four
5 - five
6 - six
7 - seven
8 - eight
9 - nine
10 - ten
11 - eleven
12 - twelve
13 - thirteen
14 - fourteen
15 - fifteen
17 - seventeen
18 - eighteen
19 - nineteen
20 - twenty
30 - thirty
40 - forty
50 - fifty
60 - sixty
70 - seventy
80 - eighty
90 - ninety
100 - one hundred
Example Use written form to write the number "23."
- How would you write the number “20” in written form?
- How would you write the number “3” in written form? Discuss with a parent or teacher.
- Now, put the two of them together. How would you write the number “23” in written form? If “20” is read as “twenty” and “3” is read as “three," then “23” is read as “twenty-three.”
When you write two-digit numbers that do not end in a zero, such as 23, you use a hyphen within the word. 23 is written as “twenty-three.” Can you name two other numbers that would be written with a hyphen by using the table above? Write the names of the two numbers on a piece of paper.
If a number has three digits, such as 345, write the number of the hundreds first and then write the rest of the number. It is very important to remember that the word “and” is not used when writing whole numbers. The word "and" is used when naming decimal numbers, such as 2.5 would be read as "two and one half." The word "and" represents the decimal point (.) when reading decimal numbers.
Example Use written form to write the number "345."
- How many hundreds does this number have? 3
- What number comes after the named hundreds? 45
First, write the number of hundreds and then write the rest of the numbers.
345 is written as “three hundred forty-five.” Discuss with a parent or teacher what you notice about the way the word “forty” is spelled.
The word "forty" represents four tens, but it is not spelled the same as the word "four." Check the spelling of words to be sure you are writing them correctly.
Example Write the number "eight hundred nine" in numerical form.
- First, write the number of hundreds. How many hundreds does the number have? Discuss with a parent or teacher.
- What number comes after the “hundreds”? Discuss with a parent or teacher.
- Write your number using numerical form on a piece of paper.
Now, let’s see if you wrote the correct number. "Eight hundred nine" means “eight hundreds plus nine ones.” There are no tens, so don’t forget to write a zero in the tens place. The number written in numerical form is 809.
Discuss with a parent or teacher why it is important to be able to write numbers in numerical form and written form.
In the Got It? section, you will practice writing numbers in numerical form and in written form as you play an online game and an interactive matching game.