Expanded Form to 1,000,000

Inside the case file

Expanded form activities, place value worksheets, and standard form practice for 4th grade are all included in this no-prep Mini Mystery Detective pack of math worksheets. Students write each number in standard form to eliminate suspects and unmask the villain across five detective cases - perfect for math centers, morning work, early finishers, sub days, and spiral review. Completely no prep - just print and go.

What's Inside

• Writing numbers from expanded form into standard form: 3,000 + 400 + 50 + 6 becomes 3,456
• Four-digit, five-digit and six-digit numbers, right through to the hundred thousands place
• Numbers with a missing place, so students have to hold the zero: 40,000 + 300 + 7 becomes 40,307
• Expanded form written out of order, so students read the place value instead of copying digits left to right: 8 + 50,000 + 400 + 300,000
• Place value names as well as numerals: 6 ten thousands + 2 thousands + 5 hundreds + 1 one
• Reading and writing numbers with commas in the correct places
• Self-checking answer keys for every case

Five detective cases to solve: the book drive bungle, the bus route riddle, the world map muddle, the calculator caper, and the fair tally tangle. Answer keys included for every case.

What is a Mini Mystery Detective?

A no-prep detective activity where students solve math problems to cross off suspects and unmask the culprit. Every answer matches one suspect's ID number, so a correct page eliminates every suspect but one - the villain. Skill practice plus critical thinking in one engaging, self-checking worksheet set.

When to Use This Resource

• Math centers and station rotations
• Morning work and bell ringers
• Early finishers
• Sub days and emergency plans
• Homework and spiral review
• Small-group intervention
• Whole-class warm-ups and test prep

Grade Levels

Designed for 4th graders. Also beneficial for struggling 5th graders who need extra place value practice and advanced 3rd graders ready for a challenge beyond three-digit numbers.

Why Teachers Love Mystery Detectives

• Zero prep - just print and hand out
• Self-checking, so students spot their own mistakes before you do
• The detective hook keeps the whole class on task
• Builds real place value understanding alongside critical thinking
• Works for the whole class, from strugglers to early finishers

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