Transaction

Name:

Date:

Class:

Quick Questions

Shade in the A or B circle for each question.

1. Which of these is a transaction?

A Ali pays Sam 5 coins for a sandwich

B Ali counts how many coins he owns

2. What does a transaction always involve?

A Only a receiver with no sender

B A sender, a receiver and an amount

3. Who is the sender in this transaction: Mia pays Leo 20 coins?

A Mia

B Leo

4. Who is the receiver in this transaction: Noah sends Zoe 12 coins?

A Zoe

B Noah

5. What should happen to every transaction?

A It can be ignored once the money has moved

B It must be recorded

Match the Pairs

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

Left column		Right column
1transaction		Asender: Mia, receiver: Noah, amount: 20
2Ava pays Liam 5 coins		BA transaction needs an amount. Without one, it is not a complete movement of money and cannot be recorded properly.
3Every transaction needs a sender, a receiver and an amount of money		CA single movement of money from one person to another, such as a payment
4Each transaction must be recorded so there is proof that the payment happened		DA transaction is only a single movement of money, not the whole system that stores or processes many payments.
5Zoe pays Leo (no amount given)		EOne transaction: a sender (Ava) sends an amount (5 coins) to a receiver (Liam)
6A transaction is the whole bank or blockchain system		Fledger.add(transaction)

Definitions

transaction

Fill in the Blanks

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

______ ← "Ava" receiver ← "Ben" amount ← 20

sender ← "Ava" ________ ← "Ben" amount ← 20

sender ← "Ava" receiver ← "Ben" ______ ← 20

transaction ← [sender, receiver, amount] APPEND transaction TO ______

___________ ← [sender, receiver, amount] APPEND transaction TO ledger

Spot the Error

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

Question 1

A sender <- "Ava"

B receiver <- "Ben"

C amount <- -25

D OUTPUT amount

Question 2

A amount <- 30

B sBal <- sBal + amount

C rBal <- rBal + amount

D OUTPUT sBal

Question 3

A amount <- 20

B IF amount >= balance THEN

C pay(amount)

D ENDIF

Question 4

A sender <- "Ava"

B receiver <- "Ben"

C amount <- 25

D record <- [sender, amount]

Question 5

A amount = 12.50

B sender <- "Mia"

C receiver <- "Leo"

D OUTPUT "Paid " + amount

Answer Key

Transaction

Section A: Quick Questions

A — Ali pays Sam 5 coins for a sandwich

B — A sender, a receiver and an amount

A — Mia

A — Zoe

B — It must be recorded

Section B: Match the Pairs

transaction → A single movement of money from one person to another, such as a payment

Ava pays Liam 5 coins → One transaction: a sender (Ava) sends an amount (5 coins) to a receiver (Liam)

Every transaction needs a sender, a receiver and an amount of money → sender: Mia, receiver: Noah, amount: 20

Each transaction must be recorded so there is proof that the payment happened → ledger.add(transaction)

Zoe pays Leo (no amount given) → A transaction needs an amount. Without one, it is not a complete movement of money and cannot be recorded properly.

A transaction is the whole bank or blockchain system → A transaction is only a single movement of money, not the whole system that stores or processes many payments.

Section C: Definitions

transaction — A single movement of money from one person to another, such as a payment of an amount from a sender to a receiver. Each one must be recorded.

Section D: Fill in the Blanks

sender ← "Ava"
receiver ← "Ben"
amount ← 20

sender ← "Ava"
receiver ← "Ben"
amount ← 20

sender ← "Ava"
receiver ← "Ben"
amount ← 20

transaction ← [sender, receiver, amount]
APPEND transaction TO ledger

transaction ← [sender, receiver, amount]
APPEND transaction TO ledger

Section E: Spot the Error

C — A payment is an amount of money moving from sender to receiver, so the amount must be positive. It should be amount <- 25.

B — The sender's balance must go down by the amount paid. It should be sBal <- sBal - amount.

B — The payment should only happen if the sender has enough money. The test should be amount <= balance.

D — A transaction record must include the sender, the receiver and the amount. The receiver is missing. It should be record <- [sender, receiver, amount].

A — In this pseudocode, a value is assigned to a variable with <-, not =. It should be amount <- 12.50.