The different times of the year are called seasons. There are four seasons in a year. They are spring, summer, winter, and autumn. Summer is the hottest season of the year. The weather is often hot and dry in summer. In autumn, many leaves change color. Many baby animals are born in spring. This is because there is plenty of food, and mild weather to help the babies grow. There is less sunlight in winter than summer because the Sun rises later and sets earlier.
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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.