Name: How to Subtract Big Numbers
Uploaded: 2019-07-19
Duration: 6 min 57 s
Description: You've mastered simple subtractions, but what if we need to subtract big numbers? Well, the bigger they are, the harder they fall! Let us learn to subtract b...

Question

Calculate the difference by estimation to the nearest hundreds and verify by actual subtraction.

$924 - 678$

Accepted Answer

Here, we need to subtract the given number i.e. $924 - 678$ and $678$ after rounding-off to the nearest hundreds.

We know that,

When rounding off to the nearest hundreds, look at the tens place digit of the given number.

If that digit is $0, 1, 2, 3, 4$ then round down to the previous hundred.

If that digit is $5, 6, 7, 8, 9$ then round up to the next hundred.

Now,

By rounding-off $924$ to the nearest hundreds, we get $900$ .

By rounding-off $678$ to the nearest hundreds, we get $700$ .

Now, subtract the estimated value: $900 - 700$

$\begin{matrix} H & T & O \\ 9 & 0 & 0 \\ - & 7 & 0 & 0 \\ 2 & 0 & 0 \end{matrix}$

Again, subtract the actual value to verify: $924 - 678$

$\begin{matrix} H & T & O \\ 8 & 11 & 14 \\ 9 & 2 & 4 \\ - & 6 & 7 & 8 \\ 2 & 4 & 6 \end{matrix}$

Hence, the estimated difference is $200$ and the actual difference is $246$ . As, both the answers are nearly equal, the result is verified as correct.

Calculate the difference by estimation to the nearest hundreds and verify by actual subtraction.

$924 - 678$

Important Questions on Subtraction

Learn and Prepare for any exam you want !

Calculate the difference by estimation to the nearest hundreds and verify by actual subtraction. 924-678

Important Questions on Subtraction

Learn and Prepare for any exam you want !

Calculate the difference by estimation to the nearest hundreds and verify by actual subtraction.

$924 - 678$