Addition of big no.
Addition1 - 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 ?
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 ?