The fastest way to do it is to use your Window's (for PC users) calculator - the programmers option (in the "View" tab);

But since there are more interesting ways to convert numbers and symbols you can play around; Here are my answers:

1. Convert 1234_{d }to binary and hexadecimal numerical systems:

1234/2 = 617 (0)

617/2 = 308 (1)

308/2 = 154 (0)

154/2 = 77 (0)

77/2 = 38 (1)

38/2 = 19 (0)

19/2 = 9 (1)

9/2 = 4 (1)

4/2 = 2 (0)

2/2 = 1 (0)

1/2 = 0 (1)

Thus, the number 1234_{d }in the **binary ****numerical system** will look like: 10011010010

The number 1234_{d }in the **hexadecimal ****numerical** **system** will look like: 4D2

2. Convert 1100101_{b} to decimal and hexadecimal numerical systems:

1100101_{b}=1+4+32+64=101

Thus, the number 1100101_{ b }in the **decimal** **numerical** **system** will look like: 101

The number 1100101_{ b }in the **hexadecimal ****numerical** **system** will look like: 65

3. Convert ABC_{hex} to decimal and binary numeral systems:

ABC_{hex} in the **decimal ****numerical** **system** will look like: 2748

ABC_{hex} in the **binary ****numerical** **system** will look like: 101010111100