# Numbers in Base Ten

## Place Value

Look at the picture of the place value chart above.

Click HERE and HERE to play games to practice memorizing the place value chart. On the pirates game, be sure to pick the decimals version.

Remember, the value of digits increase as you move to the left and the value of digits decrease as you move to the right.

## Number Forms

Standard Form: This is just the numbers

Ex.: 5,432.8

Expanded Form: This expands the number out to see more about the value of each digit.

Ex.: 5,432.8 = 5000 + 400 + 30 + 2 + 0.8

Word Form: This is how you would write it or say it. You read the number in periods, naming the periods each time.

Ex.: 912,733.82 = Nine hundred twelve thousand, seven-hundred thirty-three and

eighty-two hundredths

## Multiplying Multi-Digit Numbers

Click HERE to watch a video explain how to use place value to help you multiply multi-digit numbers. ****** This is main way we learn it in class and is the most efficient way to solve multi-digit multiplication problems with the least amount of mistakes.

Click HERE to watch a video explaining the standard algorithm for multiplying mult-digit numbers.

Click HERE to watch a video explaining the area model from multiplying multi-digit numbers.

## Multiplying Numbers with Decimals

Click HERE to watch a video explaining how to multiply numbers when they have decimals in them.

## Dividing Multi-Digit Numbers

Click HERE to watch a video explaining the Big 7 model from dividing multi-digit numbers.