658, we go from 2 tens to 2 ones.) It appears, though, as if the decimal point has shifted one place left, or, with the whole number 26580, that a 0 has been taken off.Īs we move down the list - as we push the digits to the left through theĭecimal point - each number has been multiplied by 10.Īnd so we can easily multiply or divide by a power of 10 because of our systemĮach place belongs to the next power of 10.Īt this point, please "turn" the page and do some Problems. When we divide a whole number by a power of 10, theĪnswer will have as many decimal digits are there are 0's.Īgain, as in Lesson 2, consider this array:Īs we move up the list - as we push the digits one place right - the number has been divided by 10 because each place to the right is worth 10 times less. Starting from the right of 265, separate one decimal digit. Starting from the right of the whole number, separate as 'Powers of 10' is a very useful way of writing down large or small numbers. How do we divide a whole number by a power of 10 2 means 10 × 10 100 (It says 10 is used 2 times in the multiplication) Example: 10 3 10 × 10 × 10 1,000. There are no 0's to chop off We will see that we must place a decimal point to Now in Lesson 2 we saw that when a whole number ends in 0's, weīut when a whole number does not end in 0's - as 265 - then These example illustrate that, whenever we multiply or divideīy a power of 10, the digits do not change We simply move the decimal pointįinally, we must see how to divide a whole number by a Using these powers of ten, we can rewrite the expanded notation to. Move the decimal point left as many places as A number is an abstract concept of an amount or measure, for example, two or three. How do we divide a decimal by a power of 10? Since money has two decimal digits, we added on a 0. Since 50 pounds are ten times 5 pounds, they will cost ten Pounds of sugar cost $2.79, how much will 50 pounds cost?Īnswer. The answer is a whole number, 732, which we write without a decimal However, since all the digits fall to the left of the decimal point, Move the decimal point right as many placesĪs there are 0's in the power. How do we multiply a decimal by a power of 10? The student should let go of that written method immediately. But it is not skillful, and it does not take advantage of positional numeration. Traditional multiplication would eventually give the right answer (we hope). How do we multiply a whole number by a power of 10?Īdd on as many 0's as appear in the power.ĭoing that is an example of skill in arithmetic, which is to be able to do a problem as quickly and as easily as possible. How do we multiply a decimal by a power of 10?.How do we multiply a whole number by a power.In this Lesson, we will answer the following:
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |