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King Henry Metrics

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**1. **King Henry Metrics For some students Metric conversions are confusing. The question of division or multiplication by 10, 100 or 1000 perplexes students and prevents them from successfully converting metric measurements. King Henry is a mnemonic device that helps students remember the order of the metric prefixes and helps them do metric conversions easily by moving the decimal point to the corresponding position on the King Henry chart.For some students Metric conversions are confusing. The question of division or multiplication by 10, 100 or 1000 perplexes students and prevents them from successfully converting metric measurements. King Henry is a mnemonic device that helps students remember the order of the metric prefixes and helps them do metric conversions easily by moving the decimal point to the corresponding position on the King Henry chart.

**2. **Metric System The metric system of measurement uses the following base units
Meter
Liter
Gram - Many students find the metric system confusing because it is not used much outside of the science classroom. Spend some time developing the idea of what meters, liters, and grams are. If possible, beg, borrow, or buy a meter stick, a liter container, and a gram weight. Prior to the lesson collect pictures, containers, and objects to demonstrate types of objects that are measured with meters, liters, and grams. Select an item. Ask students what type of measure they would use for that item. Sort the items into groups of items that would best be measured with meters, liters, or grams.Many students find the metric system confusing because it is not used much outside of the science classroom. Spend some time developing the idea of what meters, liters, and grams are. If possible, beg, borrow, or buy a meter stick, a liter container, and a gram weight. Prior to the lesson collect pictures, containers, and objects to demonstrate types of objects that are measured with meters, liters, and grams. Select an item. Ask students what type of measure they would use for that item. Sort the items into groups of items that would best be measured with meters, liters, or grams.

**3. **Metric System The metric system uses prefixes to denote size
kilo (k) -
hecto (h)
deka (da) -
deci (d)
centi (c)
milli (m) - Explain to students that some objects are either too large or too small to be accurately measured with a meter, a liter, or a gram, so combinations or fractions of meters, liters, and grams are used, instead.Explain to students that some objects are either too large or too small to be accurately measured with a meter, a liter, or a gram, so combinations or fractions of meters, liters, and grams are used, instead.

**4. **To convert from one unit to another in the metric system:

**5. **Use the metric prefixes to fill in each box, left to right, largest to smallest.
Make sure unit is in the middle box.

**6. **King Henry Metrics
King Henry Drank Unusually Dark Chocolate Milk Before presenting the mnemonic device, read The Story of King Henry
The Story of King Henry
As most of you are aware, England has used the metric system of measurement for a long time. At one point in history, King Henry was on the throne. He had a hard time with measurement and kept getting all mixed up when he tried to change kilometers to meters or meters to millimeters. He was so frustrated that there was something that he, the King, could not master. He called the most intelligent people of his kingdom to help him find a solution to his problem. One of the greatest mathematicians of the kingdom, Miss Bea Metric (you could use any name here) explained to King Henry, that in the metric system one is always multiplying or dividing by powers of ten, which can also be accomplished by moving the decimal.
Armed with this knowledge, King Henry and Miss Bea Metric devised a chart that worked perfectly. The mathematicians were amazed and proclaimed King Henrys chart a success. King Henry decided to test the chart on the people of his kingdom, so he took his chart and walked down the center of Main Street trying his chart on everyone he saw. As each person he met easily learned his system and mastered the chart, he became so excited that KING HENRY DANCED MERRILY DOWN CENTER MAIN.Before presenting the mnemonic device, read The Story of King Henry
The Story of King Henry
As most of you are aware, England has used the metric system of measurement for a long time. At one point in history, King Henry was on the throne. He had a hard time with measurement and kept getting all mixed up when he tried to change kilometers to meters or meters to millimeters. He was so frustrated that there was something that he, the King, could not master. He called the most intelligent people of his kingdom to help him find a solution to his problem. One of the greatest mathematicians of the kingdom, Miss Bea Metric (you could use any name here) explained to King Henry, that in the metric system one is always multiplying or dividing by powers of ten, which can also be accomplished by moving the decimal.
Armed with this knowledge, King Henry and Miss Bea Metric devised a chart that worked perfectly. The mathematicians were amazed and proclaimed King Henrys chart a success. King Henry decided to test the chart on the people of his kingdom, so he took his chart and walked down the center of Main Street trying his chart on everyone he saw. As each person he met easily learned his system and mastered the chart, he became so excited that KING HENRY DANCED MERRILY DOWN CENTER MAIN.

**7. **Your seven boxes should look like this:

**8. **The Understood Decimal In mathematics we understand that all whole numbers have a decimal point at the end of the number.
17 is understood to be 17.
3 is understood to be 3. The understood decimal is crucial to being able to do metric conversions.The understood decimal is crucial to being able to do metric conversions.

**9. **Convert 17. centimeters to meters The 7 is placed in the centimeters box because of its place value.
Think of 17 centimeters as 1 ten and 7 ones or 1 decimeter and 7 centimeters.The 7 is placed in the centimeters box because of its place value.
Think of 17 centimeters as 1 ten and 7 ones or 1 decimeter and 7 centimeters.

**10. **The King Henry Chart Convert 17. centimeters to meters
If you choose to use the leading zero, place it in the meter box IN FRONT of the decimal.If you choose to use the leading zero, place it in the meter box IN FRONT of the decimal.

**11. **Determine whether you need to move your pencil right or left to get to the new prefix.

**12. **Determine how many boxes you need to move through to get to the new prefix

**13. **Move the decimal the same number of times and in the same direction.

**14. **For example: To convert 64 kilometers to meters, follow these steps:
Starting at the FROM unit (in this case kilometers), count over (keeping in mind left or right) to the TO unit (meters).

**15. **Move the decimal in the original number the same number of places and in the same direction that you counted in Step a. In this case you will have to add some zeroes behind the decimal point.

**16. **Move the decimal in the original number the same number of places and in the same direction that you counted in Step a.

**18. **So . . .
64 kilometers equals 64000 meters
64 km = 64000 m

**19. **Try this: Convert 2.6 kilometers to meters
2 6
2.6km = 2600m

**20. **Convert 39 millimeters to meters
39
39mm = 0.039m One more: