whole and parts

Division can be seen in two ways; as splitting a whole into a certain number of pieces, or splitting it into pieces of a certain size. Help your class reach this understanding with these two simple word problems. Encourage the use of...

Adding double-digit numbers can seem difficult for some students. But, this Khan Academy video makes this process clear in a developmentally sound way. Students watch as 'Sal' adds the number 46 to 43. He references each number by its...

This is the second in a series of 3 Khan Academy videos on rounding whole numbers. Students watch Sal Khan round the number 423,275 to the nearest thousand by looking to the number in the hundreds place. If it is 5 or higher, you round...

Rounding is an important skill which must be used throughout the study of mathematics. This Khan Academy video is the first in a series of 3. It shows how to round the number 24,259 to the nearest hundred, using a number line.

Learning how to visualize is an important step in the growth of young mathematicians. The first video in this two-part series helps learners develop this ability by using visual models to explain multiplication of fractions by whole...

Expand on prior knowledge of place value to teach your class how to round whole numbers. This essential skill is explained with the help of a number line before introducing the explicit rules for rounding numbers up and down. Work...

Visual models are invaluable tools when teaching about fractions. Follow along as the instructor works through two examples, providing clear verbal and visual explanations of the steps for multiplying fractions by whole numbers. Young...

The second of eight videos on rounding whole numbers to the nearest 10 or 100 describes how to use a number line to create benchmark numbers. A review of place value and counting by 10s starts off the lesson, followed by a discussion on...

A demonstration of how to multiply a whole number times a fraction.

Two very similar numbers and you have to figure out which one is larger. The teacher diagrams a place value chart and shows you how to write the two numbers to make a comparison.