We Distribute, Yet Things Multiply
Unlock algebraic multiplication grids, master Brahmagupta's fast multiplication, crack calendar grid magic, and solve minimum-move coin conjoin!
Warmup: 3×3 Multiplication Grid Frame
The center cell of a 3×3 frame represents pq. What is the algebraic expression for the highlighted green cell?
Pick any 2×2 block of dates on a calendar. The sum of all 4 dates is given below. Find the starting date (a)!
Brahmagupta's Ishta-Gunana: Multiply large numbers in a single step using distributive decomposition!
A triangle of 10 coins is arranged below. What is the MINIMUM number of coin moves required to turn the triangle completely upside down?
Test algebraic identities (a+b)², (a-b)², and a² - b² = (a+b)(a-b) with custom values!