Pack 5 · DecimalsSection A · Everyday
Which of these three numbers is the largest?
0.6 0.58 0.417
Answer0.417
The answer a child typically writes, marked wrong.
Sample questions
Proof, not promises.
Five questions across five topics, written fresh for this page in our house style — so the real papers stay unspoiled. Each one is set to catch a single mistake. The struck-through answer is the one children actually write.
20 topics · 2,000 questions written
Pack 3 · Multiplication & DivisionSection B · Two-step
124 children are going to a concert. Each minibus holds 15 children. How many minibuses are needed?
Answer8
The answer a child typically writes, marked wrong.
Pack 1 · Place Value & RoundingSection C · Layered
What is the smallest whole number that rounds to 500 when rounded to the nearest 100?
Answer451
The answer a child typically writes, marked wrong.
Pack 4 · FractionsSection C · Layered
Zara has 24 marbles. She gives ¼ of them to her sister, then ⅓ of the rest to her cousin. How many marbles does Zara keep?
Answer10
The answer a child typically writes, marked wrong.
Pack 6 · PercentagesSection D · Super-selective
In a sale, a coat is reduced by 15% and now costs £68. What was the price before the sale?
Answer£78.20
The answer a child typically writes, marked wrong.
The full version
Every pack asks every mistake more than once.
Each time in a different form, and never the same way twice. Which of them goes wrong is what separates a careless slip from a real gap — and one wrong answer can never tell you which it was.