**High School Number Sense Lesson 98: Converting between Metric Units--with Operations**

A few weeks ago, we introduced metric unit conversions in

**ConvMetric**. This concept is an extension of that one. It appeared

**4 times**this year on high school tests, with a median placement at

**question # 16**.

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Take the time to review the metric conversions if you need to. Then you can perform operations while converting from one unit to another.

**How to Solve:**

- Look at the unit of measure required for the answer.
- Try to convert each term in the operation to the unit of measure required for the answer.
- Add or subtract as you go.

**Example 1: 3 hectometers + 20 meters = ___ meter(s)**

- 3 hectometers =
**300**meters - 300 + 20 =
**320**

**Example 2: .007 kiloliters - 3 liters = ___ liters**

- .007 kiloliters =
**7**liters - 7 - 3 =
**4**

**Example 3: 16 grams - .005 kilograms = ___ gram(s)**

- .005 kilograms =
**5**grams - 16 - 5 =
**5**

**Example 4: 4 grams - 16 decigrams = ___ centigram(s)**

- 4 grams =
**400**centigrams - 16 decigrams =
**160**centigrams - 400 - 160 =
**240**

**Example 5: 23 millimeters + 19 cm = ___ meters**

- 23 millimeters =
**.023**meters - 19 cm =
**.19**meters - .023 + .19 =
**.213**

**Example 6: If 1 cm = 0.39" then 10 meters = ___"**

- 10 meters = 10 x 100 cm =
**1000**cm - 1000 x .39 =
**390**

**Up Next for High School: Percent>Than**