Explaining why digital technology uses binary

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Quick Questions

Shade in the A or B circle for each question.

1. Which sentence gives a clear reason why computers use binary?

A Computers use binary. It is how they work.

B Computers use binary because their hardware has two states, on and off.

2. Which sentence starter helps you explain WHY computers use 0s and 1s?

A Digital hardware stores numbers as 0s and 1s because...

B Digital hardware stores numbers as 0s and 1s and...

3. Which explanation refers to switches and hardware correctly?

A A switch has ten settings, so it can store the digits 0 to 9.

B A switch is either on or off, so it can store a 0 or a 1.

4. You are explaining binary to a younger student. Which is the better explanation?

A It's like a light switch. It can only be on (1) or off (0), so computers use just those two digits.

B Binary is a base-2 positional numeral system used for encoding data in digital logic circuits.

5. Which statement is a reason, not just a fact?

A Computers use binary because electronic circuits have two states.

B Computers use binary numbers made of 0s and 1s.

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1Computers use binary because their hardware has two states.		ADigital technology uses 0s and 1s because ...
2A switch is on (1) or off (0), so it can store one bit.		BRefers to switches to show how two hardware states match the two binary digits 0 and 1.
3A sentence starter that gives a reason using because		CA clear one-sentence explanation: it gives the reason (two states) and uses the word because.
4Explaining binary to a younger student using a simple switch idea		DThe reason is wrong. Digital hardware has two states, not ten, so it uses only the digits 0 and 1.
5Computers use binary.		EIt states a fact but gives no reason. There is no because and no mention of the two states (on and off) in the hardware.
6Computers use binary because they use ten states, 0 to 9.		FThink of a light switch: it is only ever on or off, so computers use 0 and 1 because that is all their parts can do.

Definitions

Computers use binary because their hardware has two states

Fill in the Blanks

Complete each line of code by filling in the missing parts.

Computers use binary _______ hardware has two states.

Digital hardware has ___ states, on and off.

A switch is on or off, so it stores 1 for on and _ for off.

Think of a light switch: on is 1, ___ is 0, so computers count in binary.

Hardware has two states, so it stores numbers as 0s and 1s, called ______.

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A Computers use binary because

B hardware has ten states,

C on/off, so it stores 0s, 1s.

Question 2

A A switch is either on or off.

B Hardware has these two states

C so it stores data as 0s to 9s

Question 3

A Imagine a light switch, Sam.

B It is on (1) or off (2).

C Computers use switches too,

D so they use 0s and 1s.

Question 4

A Binary has ten digits because

B hardware has two states, on

C and off. One digit matches

D each state.

Question 5

A Podcast script: Why binary?

B Host: Computers use binary

C because chips are made of

D tiny dials with ten states

E So data becomes 0s and 1s.

Answer Key

Explaining why digital technology uses binary

Section A: Quick Questions

B — Computers use binary because their hardware has two states, on and off.

A — Digital hardware stores numbers as 0s and 1s because...

B — A switch is either on or off, so it can store a 0 or a 1.

A — It's like a light switch. It can only be on (1) or off (0), so computers use just those two digits.

A — Computers use binary because electronic circuits have two states.

Section B: Match the Pairs

Computers use binary because their hardware has two states. → A clear one-sentence explanation: it gives the reason (two states) and uses the word because.

A switch is on (1) or off (0), so it can store one bit. → Refers to switches to show how two hardware states match the two binary digits 0 and 1.

A sentence starter that gives a reason using because → Digital technology uses 0s and 1s because ...

Explaining binary to a younger student using a simple switch idea → Think of a light switch: it is only ever on or off, so computers use 0 and 1 because that is all their parts can do.

Computers use binary. → It states a fact but gives no reason. There is no because and no mention of the two states (on and off) in the hardware.

Computers use binary because they use ten states, 0 to 9. → The reason is wrong. Digital hardware has two states, not ten, so it uses only the digits 0 and 1.

Section C: Definitions

Computers use binary because their hardware has two states — A clear explanation says digital hardware has two states (on and off), so it stores numbers as 0s and 1s, and it gives the reason using the word because.

Section D: Fill in the Blanks

Computers use binary because hardware has
two states.

Digital hardware has two states,
on and off.

A switch is on or off, so it stores
1 for on and 0 for off.

Think of a light switch: on is 1,
off is 0, so computers count in binary.

Hardware has two states, so it stores
numbers as 0s and 1s, called binary.

Section E: Spot the Error

B — Digital hardware has two states, not ten. The line should say 'hardware has two states,' so the 0s and 1s make sense.

C — Two states can only be stored as the two digits 0 and 1, not 0 to 9. It should say 'so it stores data as 0s, 1s.'

B — Binary only has the digits 0 and 1. Off is written as 0, so the line should be 'It is on (1) or off (0).'

A — Binary has two digits (0 and 1), not ten. The line should be 'Binary has two digits because' to match the two hardware states.

D — Chips are made of tiny switches that are on or off. Dials with ten states would not give a reason for binary. It should be 'tiny switches, on or off.'