Create your own centimeter ruler. Then, estimate and measure with lengths with it. Warm up with a Mystery Math Mistake as you add two 2-digit numbers using a decomposition strategy. Think through ...

Transparent acrylic ruler, with clear scale, with cm and inch scales, measuring range 14cm. The ruler has a magnifying glass function, the magnification is 2x, and there is a circular magnifying glass ...

Measure with centimeter cubes to find the length of reptiles. Add & subtract within 100. Warm up with a Mystery Math Mistake as you add two 2-digit numbers using a decomposition strategy. What do you ...