1. An office supply store sold 310.409

pencils last year. What is the expanded

form of 310,409?

300,000 + 10,000 + 400 + 9

Step-by-step explanation:

To do expanded form you always have to look at the places that have digits.

310,409

The only digits that are found are hundred thousand, ten thousand, hundred, and ones.

Since 3 is in the hundred thousands place, it will be 300,000

300,000

Since 1 is in the ten thousands place, it will be 10,000

310,000

Nothing in the thousands place, making it worth nothing

310,000

Since 4 is in the hundreds place, it will be 400

310,400

Since nothing is in the tens place, it will be nothing

310,400

Since 9 is in the ones place, it will be 9

310,409