The seasons change four times a year. There are four seasons. They are autumn, spring, summer, and winter. Every season has different types of weather. In winter, it is cold in most places. Some animals hibernate in winter. In summer, it is hot in most places. The weather in spring makes just the right conditions for plants to grow well, like water, warmth, and sunlight. In autumn, many leaves change color.
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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.