ASCII is a character-encoding scheme that uses 7 bits to represent each character. The decimal (base 10) values 65 through 90 represent the capital letters A through Z, as shown in the table below.

What ASCII character is represented by the binary (base 2) number 1001010 ?

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To convert from base to the more familiar decimal format, represent each place value as base 2 rather than base 10.

In base ten, the value 1001010 represents:

$$1{,}001{,}010 = 10^6 + 10^3 + 10^1$$

Change the base to 2:

$$2^6 + 2^3+2^1 = 64+8+2 = 74$$