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Multiplication as Arrays 2510
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=hKozk7JMgLw
In this lessons, you'll what multiplication means using arrays for numbers 2, 5, and 10 http://www.ilearn.com/multidiv • iLearn provides professionally designed math instruction for all markets, including home, K-12, and college. Our instructional programs combine the best scientifically-designed curriculum with state-of-the art delivery systems. • Our specialty is providing easy-to-use, highly effective support, for students who have difficulty learning math. It’s the easiest and fastest way to understand math and master math procedures. • This video is one of over 800 lessons from iLearn on math topics ranging from kindergarten through high school math. • • Subscribe to our channel and have access to all of our lessons here on YouTube. • • • Share this video with your friends via your favorite social site. • For free access to unlimited online practice and tests, along with free access to these lessons, go to: • http://www.ilearn.com/multidiv • For more information, contact us at: • http://www.ilearn.com • 1-877-789-2088 ext. 128 (toll free) • If you prefer to read, rather than watch this video, here’s the transcript: • Title: Multiplication as Arrays (2,5,10) • In this lesson you’ll learn about a new way to show multiplication, an array. • You already know that multiplication is just another way of writing repeated addition. So, we can rewrite 2 times 5, like this. • Each two that we add we can show like this. Two • plus 2 • plus 2 • plus 2 • plus 2. • Now we can make an array using the blocks for each two, like this. • This checkerboard arrangement of blocks in called an array. Notice that the array is 2 tall • and 5 wide. • Let’s look at another example. • This picture is not an array, since all of the columns are of different sizes. • The addition sentence we can write from this picture is… Three… • plus 2… • plus 5… • plus 4. • Since this picture doesn’t represent repeated addition, it doesn’t represent multiplication. • Now let’s look at an picture that is an array and write the multiplication sentence from it. • This array is 5 tall • and 4 wide. • So this array shows adding 5 four times, or Five • plus 5 • plus 5 • plus 5. • Five, • ten, • fifteen, • twenty. • times 4 is equal to 20. • In any multiplication we call the numbers we multiply together factors. • And we call the result we get from multiplying the product. • So in this case 5 and 4 are factors. • And 20 is the product. • In an array, the factors are always shown by the length of the sides of an array. • And the product is shown by the total size of the array. • Let’s look at one more array. • This array is 10 tall • and 3 wide. • So this array represents adding 10 three times or Ten • plus 10 • plus 10. • When we count by ten, we have: Ten, • twenty, • thirty. • So this array shows 10 times 3 which is equal to 30. • In the remainder of this lesson you’ll write the multiplication sentence from the array, then you’ll count by a number to find the answer to the multiplication problem. • http://www.ilearn.com/multidiv • • Multiplication as Arrays (2,5,10)
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