To do the method, begin by writing the two numbers you want to multiply at the top of two columns. In the left column, you progressively halve the number and take the integer floor of any “and a half” ...

Two players compete against each other; the first to line up 4 cells of their color wins. Each of the 66 cells contains a number from 1 to 144, randomly determined each time the game is played. By ...

Struggling with mental math? Students from class 6 to 10 now have a clever way to simplify tricky multiplication problems. The “doubling square” method turns large or complex calculations into quick, ...