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 1234d 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 1234d in the binary numerical system will look like: 10011010010
The number 1234d in the hexadecimal numerical system will look like: 4D2
2. Convert 1100101b to decimal and hexadecimal numerical systems:
1100101b=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 ABChex to decimal and binary numeral systems:
ABChex in the decimal numerical system will look like: 2748
ABChex in the binary numerical system will look like: 101010111100