## Addition of big no.

__Addition__

**1 - Adding without carrying**

We have already seen the simple additions, now let us see how to add large numbers easily. To calculate easily 1245+3541, first you have to place the two numbers one below the other ligning up the units numbers, you write the symbol + and you draw a line below the two numbers.

Then you add the units numbers. 5+1=6 so you write down 6 below the line.

You do the same with the tens numbers. 4+4=8 so you write 8 below the line.

You do the same with the hundreds numbers. 2+5=7 so you write 7 below the line.

Finally, you add the thousands numbers. 1+3=4 so you write 4 below the line.

This way you can now read the result below the line :

**1245+3541=4786**.

**Train yourself!**

Use this method to answer the following question :

What is the value of 416 + 310 ?

**2 - Adding and carrying**

Sometimes, when adding two numbers of a same column, you find a result larger than 10. For example with the addition 2455+1927, 5+7=12

In this case, do not write 12 below the line but only

**2**, and the

**1**is written on the top of the column on the left. It is called

*carrying*and you then have to add it with the tens column.

Now you add the tens column, with the number you carried, 1+5+2=8 so you write 8 below the line.

Then you add the hundreds numbers, since you get a number bigger than 10, you write 3 below the line and you carry the proper number :

Finally, you add the thousands column without forgetting the number you carried. You can conclude that

**2455+1927=4382**.

**Go on training yourself!**

Use this method to answer the following question :

What is the value of 878 + 012 ?