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### Food Pyramid Power

Pre-K-2

Use algebraic thinking to explore properties of
addition.### Do It with Dominoes

Pre-K-2

Explore four models of addition (counting,
number line, sets, and balanced equations) using dominoes.### Comparing Connecting Cubes

Pre-K-2

Explore five models of subtraction (counting,
sets, number line, balanced equations, and inverse of addition) using
connecting cubes.### As People Get Older, They Get Taller

Pre-K-2

Through
the course of the lessons, students are exposed to algebra, measurement, and data
analysis concepts.### Island Inequality Mat

Pre-K-2

The
concepts of *greater than*,

*less than*, and

*equal to*are explored in this 2-lesson unit.

### Let's Count to 10

Pre-K-2

Make
groups of zero to 10 objects, connect number names to the groups, compose and
decompose numbers, and use numerals to record the size of a group.### Let's Count to 20

Pre-K-2

Make
groups of 10 to 20 objects, connect number names to the groups, compose and
decompose numbers, and use numerals to record the size of a group.