Measurement: Read Big Dog, Little dog, and then measure each child to see how tall they are. Make a chart for display, and leave out the measuring tape for a few days!

Non-standard measurement! Students predict which line is longer: the straight line or the crooked line. Then, students measure with paper clips and realize the crooked line is longer even though it doesn't appear to be!

Building Number Sense in Kindergarten and First Grade! Plenty of hands-on games and activities that have students identifying, ordering, and comparing numbers 0-20.

Colored craft sticks are labeled with the number of sides each shape has, ie: 3 purple sticks - triangle. The children will choose a color and build the matching colored shape from the sticks.