Use various models such as number lines, pictures, and base-ten blocks to illustrate addition and subtraction. 0206.2.6

Links verified on 12/30/2014

1. Base 10 Blocks - Exploring whole decimal numbers with blocks
2. Decimal Number Line - Identify and estimate decimal fractions on a number line. Move the pointer along the line, find a number between two others by looking at the next decimal place. Click on "Use the decimal number lines tool" at the bottom of the page.
3. Estimate numbers on a number line - after students make their estimate you reveal the answer and display a new problem.
4. Worksheet Generator - Print your own number line worksheets, you decide on the starting and ending numbers and the increment.