Odd and Even numbers worksheets | Free printable worksheets When you check large numbers, eg. 7,342,387, the easiest method to know if it as odd or even number is to choose the digit in ones place and check if that number is divisible by 2. In this number 7,342,387 the last digit or the digit is ones place is 7. Let us check the divisibility. Three time two is 6 and four times two is 8.