22=2*2=4
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2 to the second power is the same as 22, which is 2 x 2 or 4.
12 to the second power is 144...2 to the second power is 4, any # to the second power is the # times itself.
The exponent is 2 - from the SECOND power.
2
2 times 3 to the second power equals to 2x9 or 18 2 to the second power times 3 equals to 4x3 or 12 therefore the least common factor is 2.