The factor pairs of 98 are :-
1 x 98
2 x 49
7 x 14
The pairing that total 51 are 2 and 49.
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when both numbers are the same...
2 pairs of adjacent sides are equal
A square or a rectangle both have 2 pairs of equal sides and have right angles
The least common factor of 5 and 12 is the smallest number which divides both of them and it is 1, as it is for all pairs of numbers.(It is also the highest common factor of 5 and 12, as 5 and 12 only have one common factor: 1.)The least, or lowest, common multiple of a pair of numbers is the smallest number which is a multiple of both of them, which for 5 and 12 is 60.
There are no pairs of 2-digit numbers with a difference of 90 if both numbers are positive or both negative. However, with one positive and one negative, there are 71 pairs.