Depends in which number system!

In a decade number system 6x7=42.

In a number system with base 9 its 46.

In a number system with base 8 its 52.

In a number system with base 7 its 60.

In a number system with base 6 its 110.

In a number system with base 5 its 132.

In a number system with base 4 its 222.

In a number system with base 3 its 1220.

In a number system with base 2 its 101010.

The basic answer to 6 x 7 is the total when 6 groups of 7 are combined.

1 + 1 + 1 + 1 + 1 + 1 + 1 = 7

1 + 1 + 1 + 1 + 1 + 1 + 1 = 7

1 + 1 + 1 + 1 + 1 + 1 + 1 = 7

1 + 1 + 1 + 1 + 1 + 1 + 1 = 7

1 + 1 + 1 + 1 + 1 + 1 + 1 = 7

1 + 1 + 1 + 1 + 1 + 1 + 1 = 7

1 + 1 + 1 + 1 + 1 + 1 + 1 = 7

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All of these groups total = 42

6 x 7 is similar to 6+6+6+6+6+6+6 or 7+7+7+7+7+7. There is also another way. if you start by 1x6 and keep adding 6 more times, then you would get the answer, also if you did 1x7 and keep adding 7 five more times, then you would get the same answer.

...6 x 7 = 42

I suppose you could use simpler multipliers like:

6 = 3 x 3 so...

....3 x 7 = 21 and 2 x 21 = 42

or 7 = 5 + 2 so...

... 5 x 6 = 30 and 2 x 6 = 12 and 30 + 12 = 42 !

6X7=42

This means the sum of six sevens or seven sixes. It can also be written as 6+6+6+6+6+6+6 or 7+7+7+7+7+7. The result of both will be same, that is 42.