00:00Please see the link in the description to download a worksheet for this video.
00:05When students first learn the names of the commonplace values, they'd often forget the
00:09names for the place values on the right side of the decimals, or where exactly those names go.
00:15In this video, we'll show you a way to remember the names of the place values on the right side
00:20of the decimal, and where they go. Have you ever looked closely at a rainbow's colors?
00:25It can be hard to tell exactly where one color starts and another ends. But if we look very
00:31carefully, we can see a few colors stand out well. The innermost color is violet, then comes blue,
00:38the next color is green, then yellow, then orange, and finally, the outermost color is red.
00:44We can think of each color as being a separate arch, and each color arch stays separate from
00:49the other color arches. We can use this same idea of separate color arches to remember the names and
00:55location of the place values on the right side of the decimal point. Let's start by writing the
01:01decimal point in one dashed line. We'll label the ones place below this dashed line. Then,
01:07we'll draw five dashed lines on the left. Each dashed line will be a place value.
01:14Likewise, we'll draw five dashed lines on the right, which will also be place values.
01:19We'll write the names of the place values on the left of the decimal point.
01:25With a little practice, you'll learn the names of the place values on the left of the decimal point.
01:31That's because we use these a lot in our daily lives.
01:34Then, we draw in color arches that connect the place values on the left side of the decimal point,
01:40with the matching names on the right side of the decimal point.
01:42This is the arch for ten. On the left, we call the place value the tens place. On the right,
01:49we call it the tens place. This is the arch for hundred. On the left, we call the place value the
01:55hundreds. On the right, we call the place value the hundreds. This is the arch for thousand. On the left,
02:02we call the place value the thousands. On the right, we call the place value the thousands.
02:07This is the arch for 10,000. On the left, we call the place value the 10,000. On the right,
02:14we call the place value the 10,000. And this is the arch for 100,000. On the left, we call the
02:21place value the 100,000. On the right, we call the place value the 100,000. Here's a simplified
02:27drawing. We call this the rounding rainbow. We'll be using it a lot when rounding numbers.
02:32That's because test questions often ask us to round a number to a specific place value.
02:37So we need to know the names of the place values. When you solve test problems about place values,
02:43we encourage you to draw a picture like this. It may help you avoid mistakes.
02:48Thanks for your attention.
