Patterns in numbers: multiplication problem using the casting out of nines method

Patterns in numbers

To check any multiplication problem using the casting out of nines method.

EXAMPLE

Note: Cross out the 9 and components of 9.

In division problem, we can check the quotient by costing out nines method.

(Remember that division is nothing more than the reverse of multiplication).

Dividend = Divisor × Quotient + Remainder

EXAMPLE

Note: If the problem has remainder, we will subtract it from the Dividend.