Energy is how things change and move. It's everywhere around us and takes many forms. Light is a form of energy that travels in waves. Sun is a natural source of light while the Moon reflects the light of the Sun. Light travels in straight lines. Because it gets reflected from objects and reaches our eyes, we can see the objects. The speed of light is 186,000 miles per second which is around 870,000 times more than the speed of sound.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.