On the bench · not built yet

Money and Meters

Tenths and hundredths shown three ways: dimes and pennies, meter sticks, and grids. Change one and the others follow.

Nearby on the shelf

Compare animals and plants: "times as tall" vs "taller by." Sliders show the difference between additive...

Plant numbers as rectangular gardens; primes only grow in a single row. Find every shape for 36.

Numbers go in, numbers come out; guess the rule, then build one for classmates to crack.