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Math for Kids23 chapters | 325 lessons

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Lesson Transcript

Instructor:
*Jeremy Cook*

I have been teaching elementary school for 16 years. I have extensive experience in lesson and curriculum development and educational technology.

Whenever we want to measure how long something is, how much it weighs, or how much liquid we have, we can use the metric system to do it. But what happens if we need to convert between larger and smaller units? This lesson will show you how.

When we want to measure how tall or wide or long something is, we are measuring length. In the metric system, each way we measure has a **base unit** that we start from, which is the standard measurement amount. The base unit of length is the meter. A meter is about the length of a guitar.

For units larger than a meter, we multiply by 10, and to get smaller, we divide by 10. Each time we do this, we add a **prefix**, or word part added to the front of a word, to the word 'meter' to show the length. If we want a length smaller than a meter, we would cut it into 10 pieces. Those pieces would be called decimeters. 'Deci-' is the prefix for one-tenth of a meter.

If we want to weigh something, or find its mass using the metric system, we would use the base unit called a gram. Just like with length, we either get larger by the power of 10 or smaller by 10. Each new unit simply adds a different prefix, and the great thing is that the prefixes are the same. So what weighs a gram? If you hold two regular paper clips in your hand, you'll be holding a gram. If we want to weigh something larger, we would multiply a gram by 10, giving us 10 grams, or a decagram.

Have you ever been to a baseball game? Each baseball stadium has a capacity, meaning it has a limit to the amount of people that can fill the space. When we measure capacity, we are usually talking about liquid. Have you been to a party and seen a big bottle of soda on the table? I'll bet you didn't know that the soda in that bottle is measured using the metric system. It's in liters. The base unit of capacity in the metric system is the liter. A liter is about the same as a quart of milk. And just like length and mass, we add the same prefixes to get larger or smaller units. So 100 liters would be a hectoliter.

So to convert between units, you simply need to move the decimal place over the number of spaces on the prefix chart and change the prefix. If you are going from a small unit to a larger unit, you move the decimal place to the left. If you are going from a large unit to a small unit, you move the decimal to the right.

Let's practice a conversion. Let's say we have 1 deciliter and we want to convert it to hectoliters. All you need to do is move the decimal place over to the left three places. So 1.0 deciliters converts to .001 hectoliters.

Now let's go from large to small. So if we have 1.0 kiloliter, which is 1,000 liters, and we needed to find out how many decaliters that is, we move the decimal place over two places to the right. So 1.0 kiloliter is equal to 100.0 decaliters.

All metric units of measure have a **base unit**, the standard measurement amount, and use the metric **prefixes**, or word parts added to the beginning of words, to describe larger and smaller units. Metric units are meters for length, grams for mass, and liters for capacity. To convert between units, you simply move the decimal place right to get smaller units and left to get larger units.

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Math for Kids23 chapters | 325 lessons

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