Mathematics
Grade-4-
Easy
Question
Use estimation and rounding to choose the appropriate answer for each problem:
In a city, there are 45,960 electric cars and 96,113 gas cars. There are about
more gas cars than electric cars.
- 5,000
- 50,000
- 5,100
- 5,010
Hint:
ROUNDING
One very simple form of estimation is rounding. Rounding is often the key skill you need to quickly estimate a number. This is where you make a long number simpler by ‘rounding’, or expressing in terms of the nearest unit, ten, hundred, tenth, or a certain number of decimal places.
For example, 1,654 to the nearest thousand is 2,000. To the nearest 100 it is 1,700. To the nearest ten it is 1,650.
The correct answer is: 50,000
Total electric cars = 45,960
Total gas cars = 96,113
Difference = 96113 – 45960 = 50,153 
50,000.(Rounding off to its nearest thousands place )
Thus, there are about 50,000 more gas cars than electric cars.
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