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The first lesson presents three-digit numbers with hundred-flats, ten-pillars, and one-cubes. Next we study three-digit numbers on a number line. In the lesson Forming Numbers—and Breaking Them Apart the child practices separating three-digit numbers into the different “parts”: hundreds, tens, and ones. These first three lessons provide the basis for understanding three-digit numbers and place value.

Next we study Skip-Counting by Tens, and soon also by twos and fives. Then we compare and order three-digit numbers.

After this, we study rounding numbers. This concept helps in quickly adding numbers mentally. We also touch on reading bar graphs and pictographs, which provide a nice application for now learned three-digit numbers.