Fact Families

Related addition (subtraction) facts are the facts that use the same numbers.

For example: Consider the subtraction sentence.

4 – 1 = 3

Let's write the related subtraction fact for the given subtraction sentence.

4 – 1 = 3

 

1a
 

We have:

 

4

Whole

1

Part

3

Part

 

From above, we can also say that:
 

4 – 3 = 1
 

1b
 

So, the related subtraction fact for the given fact is 4 – 3 = 1.
ds

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Help

The correct answer is

Remember :

The smallest number is the one that comes first while counting.

Solution :

To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.

21,27,23

21 is the smallest number.