← ACARA Digital Technologies Years 5–6

A letter as a pattern of 0s and 1s

A pattern of 0s and 1s, like a thread of two bead colours. Every letter has its own pattern, so a computer can store text as 0s and 1s.

Part of: ACARA Digital Technologies Years 5–6 — Representing Data with Numbers — Module 35

Understanding A letter as a pattern of 0s and 1s in ACARA Digital Technologies Years 5–6

What it does: A and B have different patterns, so a computer can tell them apart when it reads the thread. B, A and D each get their own pattern. Putting the patterns side by side in order writes the word BAD in binary. Binary only uses two symbols, 0 and 1, just like a thread made from two bead colours. C is 11, A is 01 and B is 10, so CAB is 11 01 10 = 110110. The other thread spells ABC. Split the thread into pairs: 10 01 11. That is B, then A, then C, so it spells BAC.

Common mistakes: Every letter has its own pattern. B = 00011 is the same pattern as C. B should be 00010. Every letter pattern is 5 digits long. A = 0001 only has 4. It should be 00001.

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Free printable worksheet with full answer key — or add this module to a class and your students practise it interactively.

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This module's key terms are also in a printable crossword (Modules 73–84) and word search (Modules 73–104).

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Each concept is reinforced from every angle — learned, then applied, then tested.

Learning

Duo

How does a computer store the letter A?

As a pattern of 0s and 1sAs a tiny photo of the letter A

Matches

A = 00001, B = 00001

↓

Two letters share the same pattern, so you cannot tell A from B. Every letter needs its own pattern, for example B = 00010.

Applying

Meanings

Term

binary code

Meaning

A pattern of 0s and 1s, like a thread of two bead colours. Every letter has its own pattern, so a computer can store text as 0s and 1s.

Practice

A = 00001

Testing

Gaps

CAB = 00011 00010

Check Answer

Spots

1A = 00001

2B = 00011

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Quick Questions

1. How does a computer store the letter A?

A. As a pattern of 0s and 1s ✓

B. As a tiny photo of the letter A

Computers store text as binary code. Each letter is turned into its own pattern of 0s and 1s.

2. Binary code is like a thread of beads. Which fits best?

A. Two bead colours: one for 0 and one for 1 ✓

B. Ten bead colours: one for each digit 0 to 9

Binary only uses two symbols, 0 and 1, just like a thread made from two bead colours.

3. Which sentence is true about letters in binary code?

A. All the letters share the same pattern

B. Every letter has its own pattern ✓

Each letter needs a different pattern, so the computer can tell the letters apart.

4. In a bead code, A = 01, B = 10 and C = 11. Which thread spells CAB?

A. 110110 ✓

B. 011011

C is 11, A is 01 and B is 10, so CAB is 11 01 10 = 110110. The other thread spells ABC.

5. Using the same code (A = 01, B = 10, C = 11), what does the thread 100111 spell?

A. ABC

B. BAC ✓

Split the thread into pairs: 10 01 11. That is B, then A, then C, so it spells BAC.

Match the Pairs

A = 00001 → The letter A stored as a pattern of five 0s and 1s, like five beads on a thread

00011 00001 00010 → A thread of 0s and 1s that reads back as the word CAB

Every letter has its own pattern, so two different letters never share one → A = 00001, B = 00010

A short word can be written as a thread of 0s and 1s, with one pattern for each letter in order → BAD = 00010 00001 00100

A = 00001, B = 00001 → Two letters share the same pattern, so you cannot tell A from B. Every letter needs its own pattern, for example B = 00010.

CAB = 00011 00010 00001 → The patterns are in the wrong order. This thread spells CBA. For CAB the patterns must be C 00011, A 00001, then B 00010.

Key Term

binary code

A pattern of 0s and 1s, like a thread of two bead colours. Every letter has its own pattern, so a computer can store text as 0s and 1s.

Fill in the Blanks

1. A = 00001, B = 00010, C = 00011 CAB = 00011 00001 00010

Hint: Look at the key and type the pattern for the middle letter of the word.

2. A = 00001, B = 00010, C = 00011 BAC = 00010 00001 00011

Hint: Type the pattern that the key gives for the last letter of the word.

3. A = 00001, B = 00010, C = 00011 00010 00001 00011 = BAC

Hint: Read the middle pattern back using the key and type the letter it stands for.

4. A = 00001, B = 00010, C = 00011 Each pattern has 5 digits

Hint: Count the digits in one pattern and type how many there are.

5. 0 = red bead, 1 = blue bead A = 00001 = red red red red blue

Hint: Type the bead colour that stands for the last digit of the pattern.

Spot the Error

Question 1

A A = 00001

B B = 00011

C C = 00011

Line B — Every letter has its own pattern. B = 00011 is the same pattern as C. B should be 00010.

Question 2

A word = "CAT"

B C = 00011

C A = 0001

D T = 10100

Line C — Every letter pattern is 5 digits long. A = 0001 only has 4. It should be 00001.

Question 3

A thread = 0100001001

B first 5 = 01000 is H

C next 5 = 01001 is H

D word = "HI"

Line C — The pattern 01001 stands for I, not H. The line should read: next 5 = 01001 is I.

Question 4

A 0 = red bead

B 1 = blue bead

C A = 00001 = blue x4, red

Line C — 0 is a red bead and 1 is a blue bead. 00001 is four red beads then one blue bead, so it should be red x4, blue.

Question 5

A word = "ANT"

B thread = 00001 10100 01110

C letters = 3

Line B — The patterns must be in the same order as the letters. A-N-T is 00001 01110 10100. The broken thread would spell ATN.

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