Expanded Form Place Value to 1000

Inside the case file

Expanded form activities, place value worksheets, and standard form practice for 2nd grade and 3rd 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: 300 + 40 + 2 becomes 342
• Three-digit numbers to 1,000 - hundreds, tens and ones
• Numbers with a missing place, so students have to hold the zero: 800 + 80 becomes 880, and 500 + 6 becomes 506
• Expanded form written out of order, so students read the place value instead of copying digits left to right: 8 + 10 + 900
• Place value names as well as numerals: 8 hundreds + 2 tens + 1 one
• A final case that mixes every version together for review
• Self-checking answer keys for every case

Five detective cases to solve: the locker mix-up, the mailbag muddle, the paint pot puzzle, the lunch box bungle, and the scoreboard slip. 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 2nd and 3rd graders. Also beneficial for struggling 4th graders who need to shore up three-digit place value and advanced 1st graders ready for a challenge beyond tens and ones.

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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