This number line can be used to represent whole numbers, fractions, decimals, and percents. The value of each digit above the number line is determined by the number of zeros you add. For example, if you want the digits to represent hundreds, you would have students add two zeros to each number to create the sequence 0, 100, 200, 300, etc. To represent decimals, students would add zeros and a decimal point in front of each number. For example, if you wish to work in the hundredths place, students would add one zero in front of the one, put a decimal point in front of the zero, then add one more zero in front of the decimql point to define the unit. The sequence would look like this: 0, 0.01, 0.02, 0.03, etc. Using this number line will also give you an opportunity to reinforce the concept of a base-10 number system by asking students the value of the marks on the number line between the units. As it is, each mark between to digits is worth one-tenth; it takes ten units of this size to create 1 whole unit.