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.
Bar models in addition and subtraction problems
The order of operations and writing simple expressions
Making a bar graph plus word problems
Calculate and estimate money amounts
Calculate and estimate money amounts: word problems
Adding and subtracting large numbers
Rounding and estimating with large numbers  up to six digits
Multiples of 10, 100, and 1000
"Scales" (pan balance) problems (2 videos)
Multiply in parts 1 (partial products) – 2digit by 1digit multiplication
Multiply in parts 2 – partial products algorithm for 3digit numbers and money amounts
Estimating in multiplication: round the factors!
Multiplying in columns, the standard way — 1digit by 2,3,4digit multiplication; standard algorithm
Multiplying money amounts & money word problems (2 videos)
Multiply by whole tens in columns — aka a shortcut for 2digit multiplication when one factor is a multiple of ten
The standard multiplication algorithm with a twodigit multiplier — aka twodigit multiplication, and why we add a zero on the 2nd line (2 videos)
Videos for measurement units are found on this page. You can also use these shortcut links:
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)
The order of operations plus writing simple expressions
The remainder, part 2 – we learn to write division with a different symbol and learn about the remainder in word problems
Remainder problems – word problems involving long division with a remainder
Find fractional parts with division
Divisibility (and factors & multiples)
An introduction to prime numbers
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)Adding mixed numbers (with like fractional parts)
Subtracting fractions and mixed numbers (2 videos)
Multiplying fractions by whole numbers (2 videos)
Adding and subtracting with tenths
Two decimal digits — hundredths (2 videos)
Add and subtract decimals in columns (2 videos)
Add (and subtract) decimals mentally (2 videos)
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