 # Estimation

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• Q1

Rounding off of 730 + 998 is

Marks:1

1700

##### Explanation:

As 730 lies between 700 & 800 and 730 is less than 750, therefore it is rounded off to 700.

Similarly 998 lies between 900 & 1000 and 998 is more than 950, therefore it is rounded off to 1000

So, 700 + 1000
= 1700

• Q2

Estimated difference to the nearest hundred of 3257 – 2470 will be

Marks:1

800.

##### Explanation:
Look 257 lies between 200 & 300 since 257 is more than 250.
Therefore Rounded to 300. Similarly 470 between 400 & 500 470 is more than 450, therefore rounded to 500
= 3300 – 2500
= 800

• Q3

Rough estimate (by rounding off to nearest tens) of 439 + 334 + 4317 will be

Marks:1

5090.

##### Explanation:
Rounding to nearest tens.
439 to 440, 334 to 330, 4317 to 4320
= 440 + 330 + 4320
= 5090

• Q4

Estimation of 19 x 78 is

Marks:1

1600.

##### Explanation:
19 will become 20. 78 will become 80. So, 20 x 80 = 1600.