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In a three-digit number the digits go in columns.

 

Hundreds Tens Ones
     

 

Look at the number:

 

345

 

Put each digit in the columns like this:

 

Hundreds Tens Ones
3 4 5

 

So 345 is three hundred, four tens and five ones, which is three hundred and forty-five.

 

 

And 504 is five hundred, no tens and four ones, which is five hundred and four.

 

Hundreds Tens Ones
5 0 4

10 questions