<p>This color by number worksheet is recommended to use in 1st grade math class.<br /> It is a good method to practice addition and subtraction between 0 and 20 in a fun way. The operations can be solved by crossing the decimal scale. The theme is Santa so it can be used in december. The color code works the following way: tell the kids which result is which colour and they color the numbers on the bottom of the worksheet.</p>