Multiply (4) x (4) x (4) and get 64 .
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42 = 4*4 = 16
You evaluate the power of the power first. For example, 4 to the power of (3 to the power of 2) is 4 to the power of 9 which is 262,144
43 is the conventional way. You could always evaluate it and write 64.
It is "find the value of 3 to the 5th power".
You evaluate the powers of 10 and a exponent of positive 4.