7 x 7 = 49
7 x 9 = 63
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1 goes into both 49 and 63, as well as 7does also.
The common factors of 63 and 49 are 1 and 7.
The lowest term for 49 over 63 is 7/9
The Least Common Multiple (LCM) for 49 63 is 441.
77-49=28÷2=〔14〕 21+14=35 35+14=49 49+14=63 63+14=77