As a rotary primary math teacher, one of the most useful tools I have ever used is the hundreds chart. From 1st to 3rd grade, these charts have helped my students to develop number sense and an understanding of basic math concepts such as counting, skip counting, addition and subtraction, multiplication, patterns and number relationships. A hundreds chart is a grid of numbers from 1 to 100, usually arranged in 10 rows and 10 columns, ranging from 1-100. I would paste a blank hundreds chart and one with numbers on, back to back, on cardstock and then laminate them, keeping them in a basket for easy access with whiteboard markers. For my 2nd and 3rd graders, we also kept baskets of charts from 1-120 and 101-200. Here are some ways you can use a 100's chart to support student learning: Counting and number recognition : Use the chart to help students count and recognize numbers up to 100. Have students point to each number as they count aloud, or call out...