Because the modern rules now governing the Roman numeral system stipulates that 49 in Roman numerals is XLIX but the ancient Romans would have worked it out on an abacus counting device as XXXXVIIII and then probably abridged it to IL (50-1)
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To calculate the sum of 49 plus 49 plus 49 plus 49 plus 49, you would multiply 49 by 5, which equals 245. This is because addition is a form of repeated multiplication. So, 49 multiplied by 5 is 245.
There are infinitely many answers. One of the easier ones is 1 + 48 = 49
49*49 is 2,401
7*7=49 1*49=49 -7*-7=49 -1*-49=49
The LCM of 7 and 49 is 49.