Math for teachers
posted by cassie .
Convert the baseten number to a numeral in the indicated base.
19)
15 to base two
19)
______
A)
11110two
B)
111two
C)
1110two
D)
1111two

Math for teachers 
Reiny
19 = 16 + 2 + 1
= 2^4 + 0(2^3) + 0(2^2) + 2^1 + 2^0
= 10011_{2}
aRgghh!, just realized that 19 was the question #
but let's leave it as another example
15 = 8 + 4 + 2 + 1
= 2^3 + 2^2 + 2^1 + 1
= 1111_{2}
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