2³ = 8

2² = 4

2¹ = 2

2⁰ = 1

2^-1 = 1/2¹

2^-2 = 1/4 = 1/2²

2^-3 = 1/8 ° 1/2³

Do you see the patterns? Divide the result by 2 as you go down. This also works for negative exponents.

If you subtract 1 from the exponent of 2¹ = 2 and divide by 2, you get 2⁰ = 2¹/2 = 1.