Three-Digit Addition and Subtraction in Columns — PickAClass
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⏱ 3h 📚 30 lessons

Three-Digit Addition and Subtraction in Columns

Master place value alignment, carrying, borrowing, and mental estimation through clear step-by-step written arithmetic explanations.

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About this course

Performing multi-digit arithmetic confidently begins with understanding place value alignment and structured column calculations. This foundational text-only course guides learners step-by-step through adding and subtracting three-digit numbers using column alignment, carrying over, borrowing across place values, and verifying mathematical results. What you'll learn: - Understand place value concepts including hundreds, tens, and units - Align three-digit numbers correctly for column operations - Perform column addition with regrouping and carrying over - Apply column subtraction techniques with borrowing across digits - Estimate sums and differences to quickly verify answer accuracy - Practice step-by-step written calculations to build accuracy and speed The lessons begin with basic terminology and place value rules before moving through clear, structured written operations and practical calculation exercises. This course is ideal for beginners, young learners, or anyone needing a fresh review of elementary arithmetic, with no advanced mathematical background required. Start reading today to build lasting confidence in multi-digit column arithmetic.

Course contents

What you'll get

  • 📜 Certificate of completion
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  • 💬 Personal AI tutor
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  • ♾️ Lifetime access
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  • 📱 Phone or computer
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  • 💸 14-day refund
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  • ⚡ Short & focused
    3h of practical content

Certificate of completion

Every course you complete on PickAClass issues a credential like this — original, with its own code, verifiable by URL, and detailed about what was actually demonstrated.

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Three-Digit Addition and Subtraction in Columns
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Performance detail
Coursework summary
Lessons completed 14 / 14
Practice questions 26 / 28
Assignments submitted 4 (avg 4.5 / 5)
Capstone project Reviewed — 4.6 / 5
Total practice 6.2 hrs
Performance benchmark
Cohort rank Top 12% of 1,625
Time to completion 11 days (median: 22)
Mastery score 91 / 100
Practice-question score 94%
Skill verification Verified Skill Path
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pickaclass.com/certificates/PCC-2026-X4F7-AP19
Issued under the academic standards of PickAClass. Skill levels reflect assessed performance against the course's competency rubric. This is an original credential of this platform.

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Frequently asked

What do I need to take this course? +

Just a phone or computer with internet. No installs, no special hardware.

How do I pay? +

By card via Stripe. We don’t store card details — Stripe handles them securely.

Can I get a refund? +

Yes — full refund within 14 days, no questions asked.

How long will I have access? +

Forever. Once you purchase, the course is yours to revisit anytime.

Will I get a certificate? +

Yes. On completion you'll receive a certificate you can add to your LinkedIn profile.

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