Math MysteriesMake a mystery

Hogwarts Math Adventures

A free, printable Grade 3 multi-step word problem worksheet themed around Harry Potter. Each problem takes two or three steps to solve. Work them on screen or print the PDF — a teacher/parent answer key is included.

  1. CHOCOLATE FROG CARDS

    Harry wants to collect 200 Chocolate Frog cards. He starts with 85 cards. Today, he gets 42 new cards from Ron but loses 15 cards in a wizard duel. How many more cards does Harry need to reach his goal of 200?

    Answer:

  2. QUIDDITCH CUP

    In a Quidditch match, Gryffindor scores 3 goals worth 10 points each. Then Harry catches the Golden Snitch for 150 points. If Slytherin has 120 points, how many more points does Gryffindor have than Slytherin?

    Answer:

  3. HERBOLOGY CLASS

    Neville wants to plant 500 Mandrake seeds. He currently has 3 hundreds and 8 tens of seeds. If Professor Sprout gives him 45 more seeds, how many more seeds does Neville still need to reach 500?

    Answer:

  4. DIAGON ALLEY SHOPPING

    Hermione goes to Diagon Alley with 100 Sickles. She buys a spellbook for 42 Sickles and some parchment for 18 Sickles. She wants to buy a new quill that costs 55 Sickles. How many more Sickles does she need?

    Answer:

  5. POTIONS INGREDIENTS

    Professor Snape has a jar with 250 lacewing flies. He uses 85 flies for a morning potion and 110 flies for an afternoon potion. Then, he adds 45 new flies back into the jar. How many flies are in the jar now?

    Answer:

  6. OWL POST

    The Hogwarts Owlery has 120 owls resting. In the morning, 48 owls fly out to deliver mail. Later, 15 owls return, but then 32 more owls fly out. How many owls are left resting in the Owlery now?

    Answer:

Show answer key (for grown-ups)
1.Harry wants to collect 200 Chocolate Frog cards. He starts with 85 cards. Today, he gets 42 new cards from Ron but loses 15 cards in a wizard duel. How many more cards does Harry need to reach his goal of 200?88
2.In a Quidditch match, Gryffindor scores 3 goals worth 10 points each. Then Harry catches the Golden Snitch for 150 points. If Slytherin has 120 points, how many more points does Gryffindor have than Slytherin?60
3.Neville wants to plant 500 Mandrake seeds. He currently has 3 hundreds and 8 tens of seeds. If Professor Sprout gives him 45 more seeds, how many more seeds does Neville still need to reach 500?75
4.Hermione goes to Diagon Alley with 100 Sickles. She buys a spellbook for 42 Sickles and some parchment for 18 Sickles. She wants to buy a new quill that costs 55 Sickles. How many more Sickles does she need?15
5.Professor Snape has a jar with 250 lacewing flies. He uses 85 flies for a morning potion and 110 flies for an afternoon potion. Then, he adds 45 new flies back into the jar. How many flies are in the jar now?100
6.The Hogwarts Owlery has 120 owls resting. In the morning, 48 owls fly out to deliver mail. Later, 15 owls return, but then 32 more owls fly out. How many owls are left resting in the Owlery now?55

About Math Mysteries

Math Mysteries makes free, printable math for kids ages 6–12 — personalized to what your child is into. Beyond practice sheets like this one, you can generate a full math mystery whodunit (solve the math to catch the culprit), or browse free printable worksheets by grade, skill, and theme. Every puzzle is verified to have one correct answer.

Keep exploring

Free Printable Math Mystery Worksheets (Grades 1–5)
Hundreds of free, printable math mystery worksheets — pick a grade, print the case, and your kid solves math to catch the culprit.
Math Mystery Games for a Kid Who Hates Worksheets
An honest guide to detective-style math for kids who groan at drills — what actually works, and when a mystery beats a game.
Detective Math: Story-Driven Practice for Ages 6–12
How whodunit math turns arithmetic into deduction — the method, the research-backed why, and how to start today for free.