Write an equation with an unknown for a word problem

Telling time using "past": how many minutes past/after the hour (2nd grade math lesson)

Divide fractions: how many times does it fit? (5th grade math)

Divide fractions: equal sharing (whole-number divisor)

Missing-number puzzles (3rd grade math)

How to subtract a single-digit number from a three-digit number with mental math

Choose a number sentence with unknown to match a word problem (3rd grade math)

Add a three-digit and a single-digit number with mental math (3rd grade math)

Write an addition or a subtraction with an unknown for word problems (3rd grade math)

Mental math strategy: use an easier problem

Subtract 3-digit numbers with mental math: use place value

Mental subtraction strategy: think of the difference between the numbers

Mental math strategy: subtract in parts

Mental subtraction strategy: use basic subtraction facts

Puzzle corner: solve for two unknowns using guess & check

Strategies for mental math: use an easier problem to help you

Strategies for mental math: add in parts & use a known fact

Counting dimes, nickels, and pennies (1st grade math lesson)

Learning about quarters (1st grade math lesson)

Practice problems for making money amounts with cents (1st grade math)

Practice problems with quarters, dimes, nickels, and pennies (1st grade math)

How many hours pass between these times (1st/2nd grade math lesson)

What time is it half an hour later? A whole hour later? (1st grade math)

Practice problems for telling time: whole and half hours (1st grade math)

Telling time - whole and half hours - minute hand included (1st grade math)

How to use a chart to convert metric units - super easy!

The basics of the metric system

"How many more" word problem example - Mathy's and Giganto's jumping jacks

"How many more" word problems and the concept of difference (2nd grade math)

Learn about grams and kilograms on a kitchen scale (3rd grade math)