Hi. I am curious after seeing a gif with a child using a technique to multiply 9. Is there a name for what I found while playing with multiplying other numbers.....or is it just an insignificant fluke?
For example:
7 x1= 7 27
X2=14 24
X3=21 21
X4=28 18
X5=35 15
X6=42 12
X7=49 9
X8=56 6
X9=63 3
Where the second digit seems to be or part of a multiple of 3 in reverse order (or from 9 back to 1).
If I do this with multiplying 3, the second digits are multiples of 7 in reverse order. I did this with all numbers from 1-9 and they all had this type of partnership with another number.
1 and 9
2 and 8
3 and 7
4 and 6
5 with itself
Again, does this have a name/significance or is it just a coincidence and irrelevant?
TIA
For example:
7 x1= 7 27
X2=14 24
X3=21 21
X4=28 18
X5=35 15
X6=42 12
X7=49 9
X8=56 6
X9=63 3
Where the second digit seems to be or part of a multiple of 3 in reverse order (or from 9 back to 1).
If I do this with multiplying 3, the second digits are multiples of 7 in reverse order. I did this with all numbers from 1-9 and they all had this type of partnership with another number.
1 and 9
2 and 8
3 and 7
4 and 6
5 with itself
Again, does this have a name/significance or is it just a coincidence and irrelevant?
TIA