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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, 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.


Addition, subtraction, rounding, and graphs

Bar models in addition and subtraction problems

Rounding 4-digit numbers

Estimating the final result

The order of operations and writing simple expressions

Bar graph and problems

Round and estimate money amounts

Money word problems


Multiplication

Use mental math (partial products) to multiply

Multiply 1-digit by 2,3,4-digit number - standard algorithm

Multiplying money amounts: estimation and word problems

Shortcut for 2-digit multiplication when one factor is a multiple of ten

Two-digit multiplication and why we add a zero on the 2nd line


Measurement

Videos for measurement units are all found on this page. You can also use these shortcut links:

Measuring length to the nearest 1/8 inch and in cm/mm
Conversions between inches, feet, and yards
Metric units of length (from millimeter to kilometer)
Measuring weight in customary units
Measuring Weight in the Metric System
Metric units of volume
Measuring temperature — Celsius and Fahrenheit degrees
Time units


Geometry

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

Review: Area and perimeter

Lines, rays, and angles

How to use the protractor

Estimating angles

How to draw a right angle and a rectangle

Parallelograms

Acute, obtuse, and right triangles


Division and divisibility

Find a fractional part of a quantity (using division)

The order of operations plus writing simple expressions

Basics of division with remainders and practice with it

How to teach long division

Concept of average

Remainders in simple_division_word_problems


What is a factor? A multiple? What does it mean to be "divisible"?

How to find all the factors of a given number

An introduction to prime numbers


Fractions

Mixed numbers to fractions and vice versa

Adding mixed numbers with like fractional parts

Equivalent fractions


Decimals

Decimals: tenths

Two decimal digits: hundredths




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