The rainbow number grid makes it easy for students to change between decades without losing their place. When they reach a multiple of 10, the color will help them navigate to the number that is one larger. This will help those students who have trouble transitioning from one line of the number grid to the next without skipping lines.
The practice set provides a few addition and subtraction problems for students to use this tool to navigate between decades.
Print one out for each student or just have some available in the room for struggling students to use as a tool when needed.