When you order numbers to 100, you can arrange them from smallest to greatest or from greatest to smallest. Look at the tens first and then the ones if you need to. This number line goes from 0 to 100 ...
Many people use one finger to count a number when asked, 'Use both fingers to count numbers.' In this How to count, to be counted using both hands is up to 0 to 10, more than to count the number of, ...