Mathematics
Grade-4-
Easy
Question
Use estimation and rounding to choose the appropriate answer for each problem:
The distance between the two bus terminals is 390 km. It takes the bus 4 hours to go from one terminal to another. The speed of the bus is about km per hour.
- 100
- 10
- 386
- 390
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: 100
Distance between two bus terminals = 390 km
Time taken to reach the bus between two terminals = 4
Speed = 
Speed of the bus = 390 ÷ 4 = 97.5 
100 km per hour (Rounding off to nearest hundred)
Thus, the speed of the bus is about 100 km per hour.
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