Practice multiplying by 9 using your fingers and several math games. Explore the Multiply by 9 facts by recognizing there is only one new fact: 9 x 9. Compete against characters to see who finds the ...

Use multiplication to tell "how many." Multiply by 2 using the grouping of objects. Explore multiplication to help us tell "how many." Multiply by 2 using the grouping of objects and arrays. Connect ...

In 1971, German mathematicians Schönhage and Strassen predicted a faster algorithm for multiplying large numbers, but it remained unproven for decades. Mathematicians from Australia and France have ...