Binary Addition

Question 1

• NOT A FLASH CARD -

Now, it is important to remember the following:
0 + 0 = 0
0 + 1 = 1
1 + 0 = 1
1 + 1 = 2
1 + 1 + 1 = 3

This is obvious but we also know that computers only use binary (zeros and ones), so there is no 2 or 3.
Instead, we need to use the binary equivalent values for 2 and 3, which are:

Denary
Binary
0 = 00
1 = 01
2 = 10
3 = 11

Question 2

Now for some questions; these require a pen and paper:

01011001 + 01100100?

Answer 2

10111101.

Question 3

11110000 + 00001111?

Answer 3

11111111.

Question 4

10101011 + 00010101?

Answer 4

11000000.