Question

Standard form of 900000000 + 300000 + 70000 + 200 + 10 + 7 is _______.
(a) 900370217
(b) 90370219
(c) 900037217
(d) 90370217

Answer 1

Hint: Assume the given expression of sum as E. Add the corresponding place value digits of all the numbers one by one. For example: - add the unit place digits of all the numbers, tens place digit of all the numbers and so on. Use the carry method, if required, to get the answer.

Complete step by step answer:
Here we have been provided with the sum 900000000 + 300000 + 70000 + 200 + 10 + 7 and we are asked to write it in standard form. Let us assume the given expression as E so we have,
$\Rightarrow $ E = 900000000 + 300000 + 70000 + 200 + 10 + 7
Now, to add the given numbers we need to follow the basic rule of addition of two or more numbers. That means we have to add the unit place digit of all the numbers with each other, tens place digit of all the numbers with each other and similarly the hundred place digits, thousand place digits and so on.
We can see that in the assumed expression E we have the unit place digit of 7 as 7 and the other five numbers as 0, so we will have 7 as the unit place digit of the resultant numbers. Similarly, considering the same rule for the other place values of the resultant number we get,
$\therefore $ E = 900370217

So, the correct answer is “Option a”.

Note: Here we do not require the carry method for the sum because the sum of any face value did not exceed 10. If that happens then we carry the tens place digit to the next sum and write the ones place digit below the considered sum. You must understand the Indian system of numeration and the International system of numeration as they are used while writing the place values of the digits in a number.