Patterns in numbers: multiplication problem using the casting out of nines method
Chapter: 4th Maths : Term 1 Unit 3 : Patterns
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 casting out nines method.
(Remember that division is nothing more than the reverse of multiplication).
$$Dividend = Divisor \times Quotient + Remainder$$
EXAMPLE
Note: If the problem has remainder, we will subtract it from the Dividend.