Other
Bipm: The International System of Units (Si)
BIPM (Bureau International des Poids et Mesures) is an international organization, located in France, an equivalent of our National Institute of Standards and Technology (NIST). This site is the BIPM intro page to their official...
National Institute of Standards and Technology (NIST)
International System of Units: Si Base Units
This is the definitive source for information on SI base units, derived units, squares, cubes, luminosity, field strength and flux density.
Curated OER
Zona Land: Trigonometry, Right Triangles
This site provides information on sine, cosine, and tangent. Lengths of the sides are discussed and many diagrams/tables are shown.
Other
Science Made Simple: Conversions for Length Measurement
This site allows you to type in various lengths you want to covert. For example, if you want to find out how many feet there are in 10 meters, you can submit that information and get the answer.
Science Made Simple
Science Made Simple: Area Measurement Conversions
This site allows you to type in an area of measurement you want to be converted. The site converts it for you!
Other
Conversions for Weight Measurements
This site allows you to convert weight/mass measurements. For example converting tons to grams. CCSS.Math.Content.3.MD.A.2 Measure and estimate liquid volumes and masses of objects using standard units