# Write a number in expanded form

Learning to write numbers in expanded form is an easy way to remember the importance of each digit's placement, or its place value, in a number. Understanding Place Values Try counting up from zero: If your eyes sink into the back of your head when you see a number like that, imagine if you had to make calculations with it. Just to multiply or divide it by the speed of light, you would need a calculator so large it wouldn't fit in your hand.

Scientists handle very large numbers like this one, as well as very small numbers, by converting them to standard form, which is a decimal number followed by an exponent of The decimal can be accurate to as many places as desired, but it's usually rounded to two.

The value of the exponent indicates the magnitude of the number. In standard form, the distance to the nearest star is a much more manageable 4. If the entire original number is greater than 1, count the numbers that appear to the right of this decimal.

The number you find by counting is the exponent. Multiply the number, now in the form of the first digit, decimal point, and next two digits, by 10 raised to this exponent.

If the number is less than 1, count the numbers to the left of the decimal and multiply by 10 to a negative exponent of the number you counted.

Groups of Three Before converting a number to one containing an exponent, remember another convention, which is to split number strings into groups of three — or thousands — with commas. For example, the number is usually written , The first three digits in a number are the ones that appear when you express the number in standard form.

This is true even if the first group contains only one or two digits. For example, the first three digits of the number 12, are 1, 2 and 3. Positive and Negative Exponents Very small numbers, such as the radius of an atom, can be just as unwieldy as very large ones.

You use the same strategy to convert either to standard form. If the number is large, you set the decimal after the first digit on the left, and you make the exponent positive.

It equals the number of digits that follow the decimal. If the number is very small, the first three digits that appear after the string of zeros are the three you use at the beginning of the number in standard form, and the exponent is negative.

The exponent equals the number of zeros plus the first digit in the number series. Sciencing Video Vault Examples: In standard form, this is 3. Note that you have to round to because the fourth digit is larger than 4. The distance between the nucleus and electron of a hydrogen atom is 0. In standard form, this is 5. You don't have to round up, because the digit following 9 in the original number is less than 5. It's easy to add and subtract numbers in standard form, as long as they have the same exponents.

You simply add or subtract the strings of digits. If the numbers have different exponents, convert one of them to the exponent of the other. The first number is the same as X Note how as the decimal point moves, the exponent changes.

Adding them, we get The answer is When you multiply numbers in standard form, you multiply the strings of numbers and add the exponents.

When you divide one number by the other, you perform the division operation on the number strings and subtract the exponents. The answer is 4. The answer is 2.Practice reading and writing numbers written in expanded form.

Example: The expanded form of is + 70 + 6. Write each number in its expanded form. Math Game Time is your destination for the best math games and homework help barnweddingvt.com games are fun and educational, as well . Write each number in expanded form and then write the number in word form.

The first one is done for you. Number Expanded form 1. 1, 1, + + 40 + 2 Number word Expanded Form Worksheet 2 Author: T. SMith Publishing Subject: Write the expanded form and the word form of numbers with up to 4-digits. The Real Number System. The real number system evolved over time by expanding the notion of what we mean by the word “number.” At first, “number” meant something you could count, like how many sheep a farmer owns.

In this lesson, you will learn how to read and write numbers in expanded form by using arrow cards. An expanded form worksheet that challenges students to write given numbers in their expanded form.

## Expanded Form – Math Game Time

e.g. write 4, as 4, + + 80 + 3. Number ranges can be limited up to . Expanded Form (A) Homework - ProProfs Quiz