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# Free math video lessons for 5th grade This is a collection of free math videos for 5th grade, showing varied exercises for each topic. They match Math Mammoth Grade 5 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. I will expand the list as I'm able to edit and upload more videos.

## Chapter 1: The four operations

Review: Addition and Subtraction – this lesson uses bar models for addition and subtraction equations, plus teaches some math terms related to addition and subtraction

Review: Multiplication and Division – simple equations, bar models, terminology

Long division with a two-digit divisor

Long division as continued (repeated) subtraction

## Chapter 1: Number theory

Divisibility rules

(Introduction to primes — as a review from 4th grade)

Prime factorization using factor trees

## Chapter 2: Place value / large numbers

Exponents and powers

Rounding large numbers

Example: finding powers of 7 with a calculator

Examples of calculator usage: word problems

## Chapter 3: Problem solving

Problem solving with bar models 1: fractional part of a whole

Problem solving with bar models 2: a word problem where total and difference are given

Problem solving with bar models 3

Problem solving with bar models 4

## Chapter 4: Decimals

Decimal place value and adding decimals, up to 2 decimal digits

Decimal place value (to thousandths)

Fractions to decimals, and comparing decimals — up to 3 decimal digits (thousandths)

Rounding decimals

Add & subtract decimals using mental math

Divide decimals by whole numbers (long division with decimals) — plus fractions to decimals

Divide decimals by whole numbers: problem solving

## Chapter 5: Graphing and Statistics

Coordinate grid

Numerical patterns in the coordinate grid

Line graphs

Drawing a histogram and a double bar graph

Mean and mode

## Chapter 6: Decimals

Multiplying decimals by decimals: the shortcut

Multiplying decimals and whole numbers: scaling

Divide decimals with mental math, part 1: sharing divisions (whole-number divisor)

Divide decimals with mental math, part 2: divisor is a decimal

Multiply and divide decimals by powers of ten

Divide decimals by decimals

Problem solving (with decimals)

Decimals in measuring units — introduction

Basics of the metric system and the prefixes

Rounding and estimating with measurements

## Chapter 7: Fractions: Add and Subtract

Mixed numbers to fractions and vice versa

Add mixed numbers (like fractional parts)

Subtract mixed numbers (like fractional parts)

Equivalent fractions

The least common denominator

Comparing fractions

## Chapter 8: Fractions: Multiply and Divide

Simplifying fractions

Multiply fractions by whole numbers

Multiply fractions by fractions

Fraction multiplication and area

Simplifying before multiplying

Multiplying mixed numbers

Multiplication as scaling/resizing

Fractions are divisions

Reciprocal numbers and the shortcut for fraction division

Divide fractions: mental math

How to divide fractions & reciprocal numbers

Ratios and fractions

## Chapter 9: Geometry

Draw a square with a given side, and copy a triangle

Draw a hexagon and measure its angles

Circles

Classify triangles

Area and perimeter problems

Volume of a rectangular prism and cubic units

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