Subtraction using a Number Line: Counting On Method

This video tutorial teaches subtraction by counting on using number lines and hundreds charts. It explains how numbers increase as you move right and decrease as you move left on a number line. The tutorial includes examples such as finding the difference between 8 and 20, calculating remaining flowers in a garden, and determining gumballs left in a machine. The lesson emphasizes that subtraction is about finding the difference, not just taking away.

Describe the process of using a hundreds chart to subtract numbers.

Explain how to find the difference using a number line.