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Math Mammoth Grade 3 videos
Free math lessons for 3rd grade

This is a collection of free math videos for 3rd grade that both explain the math topic and show a variety of exercises. They match Math Mammoth Grade 3 curriculum but will also work no matter which curriculum you follow.

The videos are useful for several purposes:

  • As a parent or teacher, you can let your student(s) watch the video for their math lesson.
  • As a learner, you can learn these topics yourself.
  • As a teacher, you can use them as lesson plans for teaching these topics. Often, one video can be made into several lessons with students.
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2024 edition video list

2018 edition video list


Math Mammoth Grade 3, 2018 edition


Chapter 1: Addition & subtraction

Mental addition — several strategies explained

Review: mental subtraction — several strategies explained

More mental subtraction — more strategies explained

More mental subtraction: Unknown in an addition or subtraction

More mental addition (3-digit numbers)

Mental subtraction with three-digit numbers

(An older video about mental addition and subtraction with 3-digit numbers)

Rounding two-digit numbers to the nearest ten

Regrouping twice in subtraction

Regrouping in subtraction with zero tens

Three-digit subtraction word problems and a puzzle

The connection with addition and subtraction

Mileage chart

The order of operations — parenthesis, addition & subtraction only


Chapter 2: Multiplication concept

Multiplication on a number line

Multiplication in two ways (multiplication is commutative)

Understanding multiplication word problems, part 1

Understanding multiplication word problems, part 2

The order of operations, part 2 — parentheses, multiplication, addition & subtraction


Chapter 3: Multiplication tables

I offer a full list of videos for the multiplication tables, which have been put together on this page.


Chapter 4: Telling time

Telling time: "past" and "till" (review from 2nd grade)

Quarter till and quarter past

Telling time to the minute

Elapsed time in minutes

Using a calendar (future or past dates)


Chapter 5: Money

Making change by counting up

Word problems with money and change


Chapter 6: Place Value

4-digit place value (thousands) and expanded form

Addition and subtraction with 4-digit numbers — mental math

Rounding 3 and 4-digit numbers to the nearest hundred

Add and subtract 4-digit numbers — a lesson on estimation


Chapter 7: Geometry

Some special quadrilaterals

Perimeter

Problems with perimeter

More about area: Area of rectangles and the distributive property

Area units

Problems to solve: area of rectangles

Area and perimeter problems — rectangular shapes


Chapter 8: Measurement

Measuring to the nearest fourth-inch

Feet, yards, and miles

Common metric units of length

Pounds and ounces (on a kitchen scale)

Grams and kilograms (on a kitchen scale)

Cups, pints, quarts, and gallons

Milliliters and liters


Chapter 9: Division

The connection between multiplication and division

Divide evenly into groups — basic concept of division

Division versus multiplication word problems

Division by zero

Division with remainders


Chapter 10: Fractions

Fractions on a number line

Mixed numbers with visual models, and on a number line

Comparing fractions, part 1 (two videos)

Comparing fractions, part 2



Math Mammoth Grade 3, 2024 edition


Chapter 1: Addition & subtraction

Addition Facts Review
See this page for videos from 1st and 2nd grades.

Mental Addition

Review: Subtraction Facts
See this page for videos from 1st and 2nd grades.

Subtraction Strategies, Part 1

Subtraction Strategies, Part 2

Difference — you can use this video to review the concept of difference from 2nd grade as necessary.

Mental Math with Three-Digit Numbers (2-3 videos)

A Letter for the Unknown 1

The Connection with Addition and Subtraction

A Letter for the Unknown 2


Chapter 2: Regrouping and Rounding

Rounding two-digit numbers to the nearest ten

How to check addition problems

Regrouping twice in subtraction

Regrouping in subtraction with zero tens, part 1

Regrouping in subtraction with zero tens, part 2

The order of operations — parenthesis, addition & subtraction only

Mileage chart


Chapter 3: Multiplication concept

Multiplying on a number line

Understanding word problems, part 1

Understanding word problems, part 2

Multiplication in two ways

The order of operations 2 — parentheses, multiplication, addition & subtraction


Chapter 4: Multiplication tables

I offer a full list of videos for the multiplication tables, which have been put together on this page.


Chapter 5: Time

Telling time: "past" and "till" (review from 2nd grade)

Quarter till and quarter past

Telling time to the minute

Elapsed time in minutes

Using a calendar (future or past dates)


Chapter 6: Money

Making change by counting up

Word problems with money and change


Chapter 7: Place Value

4-digit place value (thousands) and expanded form

Addition and subtraction with 4-digit numbers — mental math

Rounding 3 and 4-digit numbers to the nearest hundred

Add and subtract 4-digit numbers — a lesson on estimation


Chapter 8: Division

The connection between multiplication and division

Divide evenly into groups — basic concept of division

Division versus multiplication word problems

Division by zero

Division with remainders



Chapter 9: Measurement

Measuring to the nearest fourth-inch

Common metric units of length

Grams and kilograms (on a kitchen scale)

Milliliters and liters

Pounds and ounces (on a kitchen scale)

Cups, pints, quarts, and gallons


Chapter 10: Geometry

Some special quadrilaterals

Perimeter

Problems with perimeter

More about area: Area of rectangles and the distributive property

Area units

Problems to solve: area of rectangles

Area and perimeter problems — rectangular shapes


Chapter 11: Fractions

Fractions on a number line

Mixed numbers with visual models, and on a number line

Comparing Fractions 1 (2 videos)

Comparing Fractions 2 — the same kind of parts or the same amount of parts

Comparing Fractions 3 — generic practice