Mental Addition and Subtraction with Hundreds Charts

The video tutorial explains how to use hundreds charts to mentally add or subtract 10 from a number. It begins with an introduction to the hundreds chart, which consists of 100 boxes arranged in rows of 10. The tutorial demonstrates adding 10 to 167 by visualizing the process on the chart, rearranging rows to simplify the calculation. Similarly, it shows subtracting 10 from 142, again using the chart to visualize and simplify the process. The lesson emphasizes mental math skills and visualization techniques using hundreds charts.

What does it mean to add or subtract mentally, and how does a hundreds chart assist in this?

Describe how you would visualize the number 167 on a hundreds chart.