Mathematics
Grade-3-
Easy

Question

Estimate the difference between 7123 and 3678 to the nearest thousands. 

  1. 2000
  2. 1000
  3. 3000
  4. 4000

hintHint:

First of all round off the number to nearest thousand and then perform subtraction.

The correct answer is: 3000


If last 3 digits are less than 500 than round off to nearest 1000 less than the number .
so, 7123 rounds off to 7000 .
If last 3 digits are greater than or equal to 500 than round off to nearest 1000 greater than the number.
so, 3678 rounds off to 4000 .
On performing subtraction
7000 - 4000 = 3000;
So, 3000 is our estimated answer.

Step 1 : Round off
If last 3 digits are less than 500 than round off to nearest 1000 less than the number .
so, 7123 rounds off to 7000 .
If last 3 digits are  greater than or equal to 500 than round off to nearest 1000 greater than the number.
so, 3678 rounds off to 4000 .
Step 2 : On performing subtraction
7000 - 4000 = 3000 ;
So, 3000 is our estimated answer.

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