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Now in order to explain why 1, 4 and 5 form a fact family we have to first use basic operations among them to

check if they satisfy it.

For instance, 1+ 4= 5 (‘5’ is the member of the given family)

Similarly, 4+ 1= 5

Also, 5– 4= 1 (‘1’ is a member of the given family)

Similarly, 5– 1= 4 (‘4’ is also the member of the given family).

Hence 1, 4, and 5 form a fact family!

Now in order to check if 6, 9 and 15 form a fact family or not, we have to first use the basic operations among

them.

6+ 9= 15 (‘15’ is the member of the given family)

And, 15–9= 6 (‘6’ is a member of the given family)

Similarly, 15- 6= 9 (‘9’ is also the member of the given family).

Hence 6, 9 and 15 form a fact family since they form equations among themselves!