Let's find the number which should be added to 6 to make a 10.
6 + ? = 10
To find the required addend, let’s consider a model with 10 blocks and fill it with 6 balls.
Here, notice that we need four more balls to fill all the 10 blocks.
6 + 4 = 10
So, the required addend is 4.
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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.