Curated OER
How Do You Multiply Decimals?
Find the product of numbers that have decimals. First, ignore the decimals and multiply the integers. Second, count the place values of the decimals for each value given. Third, add the values together. Fourth, place the decimal in the...
Curated OER
How Do You Find the Value of a Digit in a Whole Number?
The instructor illustrates place value by first drawing a place value chart. Then she inserts the numbers in question so she can find the value of certain digits. I think her chart really helps visually.
Curated OER
How Do You Subtract Whole Numbers?
Line up your numbers! The instructor shows you how to line your numbers up by place value. Then step by step she subtracts each place value. She demonstrates how to borrow when the top value is less than the bottom value you are...
Virtual Nerd
What is Place Value?
The teacher names and explains place value. She starts at the ones, and moving left of the decimal, goes to a million. Then moving to the right of the decimal she names and explains tenths to thousandths. This is a terrific video to use...
Curated OER
Change Fractions Into Decimals
This is a terrific way to help learners understand how decimals can be described as fractions. Using 2.675 as the first example, the instructor leads viewers through the process of describing this number as a fraction. She then addresses...
Curated OER
Comparing Decimals
Comparing decimals can be easy. Watch and learn how to line up four decimal numbers vertically and then starting from the left, compare each number in each place value to determine which is largest and which is smallest. This procedure...
Curated OER
Expanded Form
Watch Allison write the number 213 in expanded form. She explains how each number is multiplied by a 1, 10, or 100 and how it relates to place value. This clip is short and fast, but could be useful for learners needing an expanded form...
Khan Academy
Singapore Math: Grade 3a, Unit 2 (Part 6)
Sal reinforces the concepts taught in the first video on Singapore's four-digit addition with a series of addition problems. The video would be an excellent homework assignment. Ask your class to view it at home and write a paragraph on...
Khan Academy
Singapore Math: Grade 3a, Unit 1 (Part 7)
Third graders use zero, four, and five to make as many three-digit numbers as possible. Sal explains that to make the largest number possible, one must put the largest number in the highest place. Each step and Sal's thought process is...
Curated OER
Singapore Math: Grade 3a, Unit 2 (Part 3)
Using three-digit numbers, this video discusses the process used to add and subtract with regrouping. The instructor also focuses on determining when and when not to regroup. It describes precisely what is happening when a problem...
Curated OER
How Do You Write a Whole Number Given in Expanded Form in Standard Form and in Words?
You've been given a number written in expanded form. You have to write it in standard form, and in word form. The instructor does a nice job illustrating and explaining just how to do both of these operations.
Curated OER
How Do You Write a Whole Number Given in Standard Form in Expanded Form and in Words?
The instructor does a good job explaining place value. She identifies each value and shows how to multiply the given number by place value to get it in expanded form. Once she has it in expanded form she demonstrates how to write it out...
Curated OER
What is Place Value for Whole Numbers?
Whole numbers are the natural numbers including zero. The instructor illustrates and explains place value. She draws a place value chart and then defines each term and what the numbers mean. She writes a number in standard form and then...
Curated OER
How Do You Multiply a Two-Digit Number by a Two-Digit Number?
It is very important to keep place value in mind when you are multiplying. The instructor draws a place value chart to help you see how to keep the numbers in their proper place. Too often pupils get messy and the numbers don't line up...
Curated OER
How Do You Find the Value of a Digit in a Whole Number?
The instructor illustrates place value by first drawing a place value chart. Then she inserts the numbers in question so she can find the value of certain digits. I think her chart really helps visually.
Curated OER
How Do You Add Whole Numbers?
Adding whole numbers can be tricky if you don't get all your numbers in alignment. So make sure to get the place value correct.
Curated OER
How Do You Multiply Decimals?
Find the product of numbers that have decimals. First, ignore the decimals and multiply the integers. Second, count the place values of the decimals for each value given. Third, add the values together. Fourth, place the decimal in the...
Curated OER
Changing Decimals Into Fractions
This simplistic explanation describes how to change a decimal into a fraction. The tutor does a good job explaining that the place value of the decimal determines the number needed in the denominator, but reduces each fraction with out...
Khan Academy
Singapore Math: Grade 3a, Unit 1 (Part 2)
As part of a series on numbers less than 10,000, a thorough presentation demonstrates how to visualize numbers in groups of a thousand. The instructor then describes how to read and write numbers less than 10,000.
Khan Academy
Singapore Math: Grade 3a, Unit 1 (Part 1)
Using a step-by-step approach, Sal from Kahn Academy visually describes what a group of 10, 100, and 1,000 means. It explores the value of numbers less than 10,000. The example is easy to understand. He puts marbles in a can, and the...
Khan Academy
Singapore Math: Grade 3a, Unit 2 (Part 4)
Use the Singapore math methods to work through simple problems. Visual representations of word problems allow viewers to start making predictions and estimating the answers. This is a good way for class members to use various methods to...
Curated OER
How Do You Add Decimals?
Need a review for adding decimals? Make sure to line up the decimals, write in zeros for placeholders, add the numbers, bring down the decimal. There you have it.
Curated OER
How Do You Add Whole Numbers?
Adding whole numbers can be tricky if you don't get all your numbers in alignment. So make sure to get the place value correct.