Free K-8 lessons and worksheets that turn skill gaps into clear next steps
LearnCrux helps families and teachers find 164 live topic paths, 528 printable worksheets, and standards-linked lessons across Math, ELA, science, and social studies from Kindergarten through Grade 8.
Start in the Right Part of the Library
These entry points help families and teachers move into the live library without guessing which page type to use first.
Compare live subject hubs
Start here when you want to see which grades and topics are already live before choosing a path.
Browse subjects →Search for an exact skill
Use search when you already know the concept, topic name, or resource type you need.
Open search →Print practice quickly
Open the worksheet directory when you want printable practice with answer keys by subject, grade, or difficulty.
Browse worksheets →Check standards alignment
Use the standards maps when you need to move from subject and grade coverage into live standards-connected topics.
Open standards →Choose a Subject to Start Learning
Live topics include lessons, worksheets, practice quizzes, and teaching guides, with more subjects and grades expanding over time.
Mathematics
Build number sense, problem-solving, and critical thinking skills with step-by-step lessons, printable worksheets, and practice activities.
English Language Arts
Develop reading, writing, grammar, and vocabulary skills through engaging stories, practice activities, and grade-level language support.
Science
Explore the natural world with clear explanations, hands-on ideas, and inquiry-based science topics for curious learners.
Social Studies
Understand communities, history, geography, and cultures through age-appropriate lessons that build civic awareness and global thinking.
Featured Learning Paths
These are live multi-step paths pulled from the strongest subject hubs, not placeholder collections.
K-2 Number Sense Foundations
Move from counting and teen numbers into addition, subtraction, and place value with a coherent early-elementary sequence.
Best for students who need stronger arithmetic foundations before later operation work.
Start this path →K-1 Reading Foundations
Start with sound awareness and simple decoding, then move into sight words and early comprehension support.
Best for early readers who still need a stronger decoding and word-recognition base.
Start this path →Living Things and Habitats
Follow a life-science path from animal needs into plant growth and then broader habitat and ecosystem relationships.
Best for classrooms or families focusing on living things, survival, and environment connections.
Start this path →Community and Civic Foundations
Move from neighborhood helpers and landmarks into communities and government so early civics stays concrete and connected.
Best for early-grade social studies that builds belonging, roles, and civic responsibility.
Start this path →A Complete Learning System
Every topic follows the same proven learning path: understand, practice, test, and support.
1. Learn
Step-by-step lessons with clear explanations, examples, key vocabulary, and fun facts written for kids.
2. Practice
Printable worksheets with problems at every difficulty level, complete with answer keys for self-checking.
3. Test
Interactive quizzes with instant feedback, hints when you're stuck, and a final score to celebrate your progress.
4. Support
Teaching guides for parents and educators with strategies, common misconceptions, and extension activities.
Open a Strong Grade Hub
These grade hubs now carry curated guidance, standards snapshots, and stronger skill entry points for each live subject.
Grade 1 Foundations
A strong starting point for addition, subtraction, place value, and early measurement.
Develop core skills in addition, subtraction, phonics, and beginning reading comprehension.
Open grade hub →Kindergarten Reading Foundations
Best for early phonemic awareness, decoding, and simple word-building support.
Build foundational skills through play-based learning — counting, letter recognition, basic shapes, and early reading.
Open grade hub →Grade 1 Observable Science
Strong for plants, light, sound, and simple motion with concrete examples.
Develop core skills in addition, subtraction, phonics, and beginning reading comprehension.
Open grade hub →Kindergarten Community Foundations
Best for introducing rules, responsibilities, helpers, and neighborhoods in concrete ways.
Build foundational skills through play-based learning — counting, letter recognition, basic shapes, and early reading.
Open grade hub →Browse Math by Grade
These are the live math grades currently available, each with lessons, practice, teaching guides, and printable worksheets.
Frequently Asked Questions
Is LearnCrux really free?
Yes, 100% free! All lessons, worksheets, practice quizzes, and teaching guides are available at no cost. No subscriptions, no paywalls, no hidden fees. We believe every child deserves access to quality education.
What grades and subjects do you cover?
Full topic collections are currently live for Math, ELA, Science, and Social Studies Kindergarten through Grade 8. We are expanding carefully instead of adding thin pages.
Are the lessons aligned to educational standards?
All live topics now include explicit standards references alongside the lesson and teaching guide. We continue to expand the library grade by grade and subject by subject.
Can I print the worksheets?
Absolutely! Every worksheet is designed to print beautifully on standard letter-size paper. Just click the Print button or use Ctrl+P (Cmd+P on Mac). Each worksheet includes an answer key on a separate page.
Who creates the content?
Each topic is built from a structured content model and reviewed for clarity, answer-key accuracy, age-appropriate language, and internal linking before it goes live.