Young Einstein Mathematics Educational Software Contents

Activity Number 30

Heading : Adding Three 4 Digit Numbers

Description : Adding three 4 digit numbers

Aim/Questions : Add the numbers together.

Educational software theory used:

Adding Three 4 Digit Numbers

When adding three numbers that have a mixture of ones, tens, hundreds and thousands in the number you need to do 4 sums.

1.  Firstly add the ones units

2.  Then add the tens units

3.  Then add the hundreds units

4.  Finally add the thousands units

As a general rule, you will need to do one step for each unit value in a number. So, if you are adding 6 digit numbers, you would do 6 separate sums.

Follow the examples as we go along:

 2176

 1234

+3248

First add the ones units, by adding the 6,4 and 8 together to get 18.

18 is made up of 1 tens unit and 8 ones.

Since we are only working with the ones, put down the ones answer in the ones column, and add 1 tens unit to the tens column.

 2176

 1234

+3248

       1

    8

Then add the tens units, by adding the 7,3 and 4 and the 1 carried over, together to get 15.

Since we are now working with the tens units, put down the ones answer in the tens column and add 1 unit to the hundreds column. 15 is made up of 1 hundreds unit and 5 tens units.

 2176

 1234

+3248

  1  1

   58

Then add the hundreds units, by adding the 1,2 and 2 and the 1 carried over, together to get 6.

Since we are now working with the hundreds units, put the answer in the hundreds column. There is no carry over from this operation.

 2176

 1234

+3248

  1

  658

Finally add the thousands units, by adding the 2,1 and 3 together to get 6.

Since we are now working with the thousands units, put your final answer in the thousands column.

 2176

 1234

+3248

 6658

Educational software Instruction :

1.  Add the three numbers together then type your answer into the ‘Answer Box’ provided.

2.  Press ‘Enter’ when you have finished.

Click on the ‘Wording’ check box if you want the sum written in a sentence.

It might be easier to have backwards entry enabled for this exercise.

Module 30. These Instructions from 'Young Einstein Mathematics educational software by Maths Practice are Copyright. Copyright Maths Practice P/L 2003 ©