4th Grade Math 12.1, Measurement Benchmarks

In video 6.6 (linked below), we learned that a benchmark is a known size or amount that helps us understand a different size or amount. We can use benchmarks to compare and relate measurement units. When we know the size of one object, we can use it as a benchmark to find the sizes of other objects. Benchmarks are not used to give exact measurements. We use them to compare sizes as an estimate. A mile is a U.S. Customary Unit for measuring length or distance. A person can walk 1 mile in about 20 minutes. We can use the distance we would walk in about 20 minutes as a benchmark for 1 mile. We can use containers as benchmarks for U.S. Customary Units of liquid volume. We can use objects as benchmarks for customary units of weight. We can even use benchmarks for metric units of measure. We review the customary units for length, liquid volume, and weight. We also review the metric units for length, liquid volume, and mass. I explain the difference between weight and mass, and which countries use the metric system. We find out what a Smoot is, as a benchmark.

4th Grade Math 6.6, Compare Fractions Using Benchmarks
   • 4th Grade Math 6.6, Compare Fractions...  

4th Grade Math Playlist
   • 4th Grade Math Course  

I'm using the Houghton Mifflin Go Math!
2015 copyright textbook for this playlist.

You can practice online using the textbook's website
https://www.gomathacademy.com/

YouTube rating for JoAnn's School videos:
L0 - No strong language
N0 - No nudity
S0 - No sexual situations
V0 - Not violent or disturbing
D0 - No drug reference or content
F0 - No flashing lights content

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