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# Free 4th grade math video lessons

This is a collection of free math videos for 4th grade, showing varied exercises for each topic. They match Math Mammoth Grade 4 curriculum but will also work no matter which curriculum you follow (in other words, the videos don't rely on you having Math Mammoth curriculum).

Please choose a topic from the list. Please realize this is not a complete coverage of all 4th grade math. There isn't (yet) a video for every lesson in Math Mammoth Grade 4 curriculum, and I hope to add to the collection in the future. Also, some of the videos are older work of mine, but listed here in case they are still helpful to some.

## Chapter 1: Addition, subtraction, rounding, and graphs Bar models in addition and subtraction problems

The order of operations and writing simple expressions

Making a bar graph plus word problems

Rounding 4-digit numbers

Estimating the final result

Calculate and estimate money amounts

Calculate and estimate money amounts: word problems

## Chapter 2: Large Numbers and Place Value

Rounding and estimating with large numbers - up to six digits

Multiples of 10, 100, and 1000

## Chapter 3: Multi-Digit Multiplication "Scales" (pan balance) problems (2 videos)

Multiply in parts 1 (partial products) – 2-digit by 1-digit multiplication

Multiply in parts 2 – partial products algorithm for 3-digit numbers and money amounts

Estimating in multiplication: round the factors!

Multiplying in columns, the standard way — 1-digit by 2,3,4-digit multiplication; standard algorithm

The order of operations again

So many of the same thing

Multiply by whole tens in columns — aka a shortcut for 2-digit multiplication when one factor is a multiple of ten

The standard multiplication algorithm with a two-digit multiplier — aka two-digit multiplication, and why we add a zero on the 2nd line (2 videos)

## Chapter 4: Time and Measuring

Time units

Elapsed time to the minute

Measuring temperature — Celsius and Fahrenheit degrees

Measuring length (to the nearest 1/8 inch and in cm/mm)

Feed, Yards, and Miles (conversions between inches, feet, and yards)

Metric units for measuring length (from millimeter to kilometer)

Customary units of weight

Metric units of weight

Metric units of volume

## Chapter 5: Division and divisibility The order of operations plus writing simple expressions

The remainder, part 1

The remainder, part 2 – we learn to write division with a different symbol and learn about the remainder in word problems

How to teach long division

Long division — step-by-step examples (several videos)

Remainder problems – word problems involving long division with a remainder

Concept of average

Find fractional parts with division

Divisibility (and factors & multiples)

An introduction to prime numbers

Finding factors

## Chapter 6: Geometry Videos for 4th (and 5th) grade geometry are found on the same page. You can also use these shortcut links:

Review: Area versus perimeter

Lines, rays, and angles

Drawing angles (How to use the protractor)

Estimating angles

How to draw a right angle and a rectangle (for the lesson "Parallel and Perpendicular Lines"

Parallelograms

Triangles (acute, obtuse, and right)

## Chapter 7: Fractions

Mixed numbers and fractions

Adding mixed numbers (with like fractional parts)

Equivalent fractions

Subtracting fractions and mixed numbers (2 videos)

Multiplying fractions by whole numbers (2 videos)

## Chapter 8: Decimals

Decimals numbers — tenths

Two decimal digits — hundredths (2 videos)

Add and subtract decimals in columns (2 videos)

Add (and subtract) decimals mentally (2 videos)

Back to all videos index

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