Stonelaw High School
Computing Science – Information Systems
National 4 and 5
BINARY
Worksheet 10
Name
Complete the worksheet below, and save it into your Software folder with the filename Worksheet 9
USING BINARY TO STORE DECIMAL NUMBERS
1
What is machine code?
2
How many different characters does machine code use?
3
Why do computers use binary instead of decimal numbers?
4
Calculate the binary number for the following decimal numbers, the first one has been
completed for you;
7
=
25
=
65
=
84
=
27
26
25
24
23
22
21
20
128
64
32
16
8
4
2
1
0
0
0
0
0
1
1
1
USING BINARY TO STORE TEXT
5
What code is used to store text in a computer?
6
How many different characters can the computer store using the 7 bit ASCII code?
1
Stonelaw High School
Computing Science – Information Systems
National 4 and 5
7
The ASCII code for a capital “A” is 65 and is illustrated below as a binary number.
A = 65 =
27
26
25
24
23
22
21
20
128
64
32
16
8
4
2
1
0
1
0
0
0
0
0
1
If the ASCII code for a capital “B” is 66, illustrate this as a binary number in the space
below;
B = 66 =
USING BINARY TO STORE BIT MAPPED GRAPHICS
8
Explain how bit mapped graphics are stored by a computer.
9
What is meant by the term screen resolution?
10
Save your completed worksheet as WORKSHEET 10 into your Software folder.
11
Ask your teacher to check your work using RM Tutor.
2