Matter is anything which occupies space and has mass. So, everything we can see, feel, and touch around us is matter. Matter exists in four states - solid, liquid, gas, and plasma. Solids have a definite shape and a definite volume. Liquids do not have a definite shape but have a definite volume. Plasma is a heated gas which becomes charged with energy. The amount of matter contained in an object is called mass.
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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.