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## Arithmetic (all content)

### Course: Arithmetic (all content)>Unit 1

Lesson 9: Ways to write whole numbers (expanded form and written form)

# Writing a number in standard form

This video demonstrates converting large numbers from expanded and written form to standard form. Using the example "six hundred forty-five million five hundred eighty-four thousand four hundred sixty-two," it explains the process and arrives at 645,584,462, emphasizing place value understanding. Created by Sal Khan and Monterey Institute for Technology and Education.

## Want to join the conversation?

• is standard form writing it in numbers?
• Yes. Standard Form is told in the most common way we write it in: numbers.
• What's an easier way to remember place values for larger numbers?
• Basically, for whole numbers, you start at the right most digit, the "ones" place. Each time you move left to a new digit, you are basically multiplying by ten. Let's look at 500: we start at the right most digit, a zero, so there are zero "ones". Then we move left, remembering to multiply our "place value" by ten. One times ten is ten, so we are in the "tens" place! In my example, 500 has a "tens place value" of zero. Finally, we move once more to the left. Ten times ten is one hundred, so we are in the "hundreds" place. 500 has five hundreds in its "hundreds place". Just remember that place values are like groups of that amount. Having five in the "ones place" really just represents 5, but having five in the "thousands place" represents five thousand!
• If I multiply 500 and 1,000,000 it will give me 500,000,000?
• Yes, you can confirm with your calculator:)
• What is standard `form`?
• Standard form is like instead of expanded form ( 100+20+3) it is just regular numbers (123)
• why do you quit thevideo like that?
• My homework says " Write the standard form of the equation of the line through the given points" I dont think is what I am looking for. Where should I go?
• How do you work out this?
The mass of a hydrogen atom is about 1.67x10 to the power -24g while that of a uranium atom is about 3.95x10 to the power of -22g.
About how many times heavier is uranium than hydrogen.
• The long way to do it would be to convert both masses (given in standard form) to ordinary numbers. Then you would divide the uranium atom's mass by the hydrogen atom's mass, to see how many times heavier the uranium atom is than the hydrogen atom.

However, you could also leave the numbers in standard form and do: 3.95 x 10^-22 divided by 1.67 x 10^-24 (using a calculator or use your index laws to do it without calculator).
= 236.5269461
And since you need the answer to 3 significant figures: = 237 times heavier.

I hope this helps.
(1 vote)
• what is the compact or standard form of 23 tens and 8 ones?
• 23 tens = 23 * 10
8 ones = 8 * 1
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