Question

# The difference of 516 and 140 using front-end estimation is ________.

- 200
- 300
- 400
- 500

Hint:

### Select first digits and perform their subtraction, and then round off next digits to nearest digits of first number base, perform subtraction and then add results together.

## The correct answer is: 400

Step 1 :

In 516, five is the first number and in 140, 1 is first number or front number so simply add them.

5 - 1 = 4 as they are at hundredth place so 400

next , 16 to nearest hundred is 0 and 40 to nearest 100 is 0 .

0 - 0 = 0 ;

Step 2 :

add all estimations 400 + 0 ;

So , 400 is our final answer.

### Related Questions to study

### There are 479 girls and 729 boys in a school. Estimate the total number of students in the school.

### There are 479 girls and 729 boys in a school. Estimate the total number of students in the school.

### The difference of 587 and 222 using front -end estimation is ________.

### The difference of 587 and 222 using front -end estimation is ________.

### The sum of 730 + 450 using front – end estimation is______.

### The sum of 730 + 450 using front – end estimation is______.

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### Estimate the sum of 5786 and 2126 to the nearest thousands.

Step 1 : Round Off ;

if last three digits are more than or equal to 500 round off to nearest thousand greater than number.

5786 rounds off to 6000.

if last three digits less than 500, then round off to nearest thousand smaller than number.

2126 rounds off to 2000.

Step 2 : Perform Addition

6000 + 2000 = 8000 ;

So , 8000 is our estimated sum .

### Estimate the sum of 5786 and 2126 to the nearest thousands.

Step 1 : Round Off ;

if last three digits are more than or equal to 500 round off to nearest thousand greater than number.

5786 rounds off to 6000.

if last three digits less than 500, then round off to nearest thousand smaller than number.

2126 rounds off to 2000.

Step 2 : Perform Addition

6000 + 2000 = 8000 ;

So , 8000 is our estimated sum .

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

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.

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

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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### The leading digit in 8574 is ________.

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