When students gather on the carpet in a circle, the teacher pours out a box of 1000 straws. “How can we count these easily?” The students are led to suggest that bundles of 10 would make it much easier to count and recount the giant pile of straws. Students skip-count and experience that 1 hundred is equal to both 100 ones and 10 tens (2.NBT.1a). Likewise, 1 thousand is equal to both 100 tens and 10 hundreds (2.NBT.1b). Just as students added and subtracted centimeter units in Module 2, in Module 3 they skip-count using bundles of straws as units. The efficiency of place value and base ten numbers comes to life as students repeatedly bundle 10 ones to make 1 ten and subsequently bundle 10 tens to make 1 hundred.