## How can I quickly multiply my mind?

Here’s the trick: Any time you square a two-digit number that ends in 5, the last digits of the answer will be 25 and the digits before that are given by multiplying the first digit of the number by the number that’s one greater.

## At what age should a child know their multiplication tables?

Children can begin to learn their multiplication tables once they have mastered basic addition and subtraction concepts and are familiar with arrays and how to count by 2’s and 5’s, which is usually by age 9. Each student is unique, and some students may be ready to learn multiplication tables earlier than this.

## What is the difference between short and long multiplication?

What is the difference between short and long multiplication? The short multiplication method is the advised route of calculation when someone wants to multiply a 2, 3 or 4 digit number by a 1 digit number. Long multiplication involves the multiplication of a 2, 3 or 4 digit number by a 2 digit number.

## How do you do long multiplication with 3 digits?

To do long multiplication of 3digit numbers, multiply all 3 digits of both numbers together individually. When multiplying by the tens digit of the bottom number, write a 0 on the end of your answer. When multiplying by the hundreds digit of the bottom number, write two 0’s on the end of your answer.