Subtraction

Pre-K–3rd

More than "take away" — subtraction teaches kids to think about differences, missing parts, and comparison.

12 articles

Skills your child will master

Subtracting within 10 and 20
Take-away vs. comparison models
Regrouping (borrowing) across place values
Multi-digit subtraction
Checking answers with addition

Uses part-whole bar models so children understand subtraction as finding a missing part, not just removing objects.

Developmental Readiness

Pre-K–2nd1

When Your Young Child Hits a Wall in Math (It's Not What You Think)

Bright Pre-K and kindergarten children can fly through early math and then suddenly stall. The reason is almost never ability — it is developmental readiness. Here is what is happening and what to do about it.

7 min readPre-K–2nd

Early Subtraction

K–1st1

How to Teach Subtraction to Young Children

Subtraction is harder than addition for nearly every child. The reason is not that 'taking away' is complex — it is that subtraction has multiple meanings. Here is how to teach all of them.

5 min readK–1st

Fact Families

1st–2nd2

What Are Fact Families in Math?

A fact family is a group of related math facts using the same three numbers. Here is what they are, why they matter, and how they connect addition to subtraction and multiplication to division.

2 min read1st–2nd

How to Teach Fact Families (The Key to Connecting Operations)

Fact families show that addition/subtraction and multiplication/division are two sides of the same coin. Here is how to teach this relationship so your child stops treating each operation as a separate world.

4 min read1st–2nd

Grade Expectations

1st–1st1

What Your First Grader Should Know in Math

A clear guide to the math skills your first grader should master — from addition and subtraction within 20 to place value, telling time, and early measurement. Know exactly what is on track.

6 min read1st–1st

Mental Math

1st–3rd1

How to Teach Mental Math Strategies for Addition and Subtraction

Mental math is not about being fast — it is about flexible thinking. Here are the key strategies that make mental addition and subtraction efficient, and how to teach them so your child stops relying on finger counting.

5 min read1st–3rd

Regrouping

1st–2nd2

What Is Regrouping in Math?

Regrouping — also called carrying and borrowing — is the process of trading between place values. Here is what it means, why it works, and how to explain it to your child.

2 min read1st–2nd

How to Teach Regrouping in Subtraction (Borrowing)

Borrowing in subtraction confuses more children than almost any other elementary math concept. Here is how to teach it with physical models so your child understands what is actually happening when they 'borrow from the tens.'

5 min read1st–2nd

Multi-Digit Operations

2nd–3rd1

How to Teach Multi-Digit Addition and Subtraction

Multi-digit addition and subtraction is where place value gets put to work. Here is how to teach the standard algorithms so your child understands why carrying and borrowing work — not just how to do them.

4 min read2nd–3rd

Homeschool Tips

8th–Pre-K1

How Homeschool Parents Manage Math for Multiple Kids at Different Levels

Managing math instruction for multiple children at different skill levels is the biggest logistical challenge in homeschooling. Here are practical strategies that actually work.

7 min read

Learning Gaps

8th–Pre-K1

Your Child Is Not Bad at Math — They're Missing a Prerequisite

When a child struggles with a math concept, the problem is almost never that concept. It is a gap in something they were supposed to learn earlier. Here is how prerequisite gaps work and how to find the real issue.

7 min read

Retention

8th–Pre-K1

Why Your Child Forgets Math Over Summer (And What to Do)

Summer math loss is real: kids lose 1-3 months of math learning over a typical summer break. Here is why it happens, which skills are most vulnerable, and a practical plan to prevent it without ruining summer.

8 min read

Your child's path through subtraction — automated

Lumastery builds a personalized path through these skills. They practice daily. You get weekly reports. No lesson planning required.

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