Young Einstein Mathematics Educational Software Contents

Activity Number 28

Heading : Adding Two 4 Digit Numbers

Description : Adding two 4 digit numbers

Aim/Questions : Add the numbers together.

Educational software theory used:

Adding Two 4 Digit Numbers

When adding two 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.

Eg

 2176

+3248

First add the ones units by adding the 6 and 8 together to get 14.

14 is made up of 1 tens unit and 4 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

+3248

       1

    4

Then add the tens units by adding the 7 and 4 and the 1 carried over, together, to get 12.

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. 12 is made up of 1 hundreds unit and 2 tens units.

 2176

+3248

  1  1

   24

Then add the hundreds units, by adding the 1 and 2, and the 1 carried over, together to get 4.

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

 2176

+3248

  1

  424

Finally add the thousands units, by adding the 2 and 3 together to get 5.

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

 2136

+3248

 5424

Educational software Instruction :

1.  Add the two 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 28. These Instructions from 'Young Einstein Mathematics educational software by Maths Practice are Copyright. Copyright Maths Practice P/L 2003 ©