Base-Ten Blocks & Regrouping

Build and regroup four-digit numbers on a 3D place-value table using Thousands cubes, Hundreds flats, Tens rods, and Ones unit blocks. Click column pads to add blocks, press Regroup / Bundle 10 to trade 10 smaller blocks for 1 larger unit, and see expanded form live.

Type any function and see its shape straight away. Plot up to three at once in three colours to compare them, drag the trace point to read a value off a curve, and see where each one crosses zero.

Spin a spinner, flip a coin or roll a die and watch two sets of bars: the chances the shapes predict, and the results you actually got. Ten spins prove nothing; a few hundred and the two are hard to tell apart.

Move m and watch the line tilt; move b and watch it slide. Or drag the two points on the line and read the equation it writes back. A rise-over-run staircase climbs the line so slope becomes something you can count.

Two bodies under gravity trace an ellipse forever and you can write the formula down. Add a third and no such formula exists. Run the figure-eight orbit, nudge one mass, and watch a stable pattern become unpredictable while the total energy stays put.