Use inverse operations to solve the equation for a variable.
For example, consider the equation a – 4 = 2.
Here, 4 is subtracted from a on the left side.
So, to find the value of a, we use inverse operation of subtraction, that is, addition.
Adding 4 to both the sides, we get:
a – 4 + 4 = 2 + 4
a = 6
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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.