Young Einstein Mathematics Educational Software Contents

Activity Number 169

Heading : Long Multiplication

Description : Using Long Multiplication, multiply a 2 digit number by a single digit number.

Aim/Questions : Perform the long multiplication by solving each section separately.

Educational software theory used:

There are several ways to tackle multiplying 2 large numbers. Here we look at the traditional method.

There are two other methods known as Box and Napier.

The traditional method is shown below:

23 x 46 = 1058

   23

x  46

  138

+ 920

 1058

You will need to do a multiplication line for every digit in the second number.

So, we do 2 sets of multiplication sums and a final addition sum to get the answer.

Follow the examples as we go along.

Step 1, multiply the top line by the ones digit (6)

   23

x  46

  138

Step 2, move to the second digit and since it is the ‘Tens’ units amount, put a zero to indicate it is ‘Tens’ units that we are working with.

   23

x  46

  138

    0

Step 3, multiply the top line by the second digit (4)

   23

x  46

  138

  920

Step 4, add the two answers

   23

x  46

  138

+ 920

 1058

Educational software Instruction :

1.  You need to work with one line at a time

2.  Work out the answers then type them into the ‘Answer Boxes’ provided.

3.  Click the ‘OK’ button when you have finished.

Module 169. These Instructions from 'Young Einstein Mathematics educational software by Maths Practice are Copyright. Copyright Maths Practice P/L 2003 ©