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Curated OER

Science Kids: Science Images: Minus Symbol

For Students 9th - 10th
A minus symbol inside a circular glossy icon.
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Visual Fractions:strict Fraction Subtraction With Circles

For Students 3rd - 8th
Use this interactive site from Visual Fractions to practice subtraction with fractions using circles. You will need to answer the questions with mixed numbers in lowest terms.
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Visual Fractions:strict Fraction Subtraction With Circles

For Students 3rd - 8th
Use this interactive site from Visual Fractions to practice subtraction with fractions using circles. You will need to answer the questions with mixed numbers in lowest terms.
Graphic
Curated OER

Houghton Mifflin: Addition and Subtraction

For Students Pre-K - 1st
Addition and subtraction are covered here, with definitions, tips & tricks, lesson plans, and a section covering typical student questions.
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Curated OER

Houghton Mifflin: Addition and Subtraction

For Students Pre-K - 1st
Addition and subtraction are covered here, with definitions, tips & tricks, lesson plans, and a section covering typical student questions.
Graphic
Curated OER

Houghton Mifflin: Addition and Subtraction

For Students Pre-K - 1st
Addition and subtraction are covered here, with definitions, tips & tricks, lesson plans, and a section covering typical student questions.
Graphic
Curated OER

Houghton Mifflin: Addition and Subtraction

For Students Pre-K - 1st
Addition and subtraction are covered here, with definitions, tips & tricks, lesson plans, and a section covering typical student questions.
Graphic
Curated OER

Houghton Mifflin: Addition and Subtraction

For Students Pre-K - 1st
Addition and subtraction are covered here, with definitions, tips & tricks, lesson plans, and a section covering typical student questions.
Graphic
Curated OER

Visual Fractions: Fraction Subtraction With Circles

For Students 3rd - 8th
Use this site to learn how to subtract fractions using circles at this site from Visual Fractions. You will receive immediate feedback on your answers.
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Curated OER

Eqnarray11

For Students 9th - 10th
In this lesson, special cases of factoring are described, including perfect squares, difference of squares, and difference and sum of cubes. Exercises with answers included.
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Eqnarray23

For Students 9th - 10th
In this lesson, special cases of factoring are described, including perfect squares, difference of squares, and difference and sum of cubes. Exercises with answers included.
Graphic
Curated OER

Eqnarray26

For Students 9th - 10th
In this lesson, special cases of factoring are described, including perfect squares, difference of squares, and difference and sum of cubes. Exercises with answers included.
Graphic
Curated OER

Eqnarray29

For Students 9th - 10th
In this lesson, special cases of factoring are described, including perfect squares, difference of squares, and difference and sum of cubes. Exercises with answers included.
Graphic
Curated OER

Personal Site: Prisms and Antiprisms

For Students 9th - 10th
This site is a personal site that explains the difference between a prism and an antiprism. Pictures of a heptagonal prism and a heptagonal antiprism help illustrate this difference.
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Personal Site: Prisms and Antiprisms

For Students 9th - 10th
This site is a personal site that explains the difference between a prism and an antiprism. Pictures of a heptagonal prism and a heptagonal antiprism help illustrate this difference.
Graphic
Curated OER

Etc: Maps Etc: Mean Average Temperatures in North America, 1906

For Students 9th - 10th
A map from 1906 of North America showing the mean annual isotherms of the region given in degrees Fahrenheit. "The climate of North America naturally varies greatly, depending on latitude, the general atmospheric circulation or direction...
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Etc: Maps Etc: Mexico, Central America, and the West Indies, 1898

For Students 9th - 10th
A map from 1898 of Mexico, Central America and the West Indies. The map includes an inset map of Cuba and the Isthmus of Nicaragua. "The surface of the Rocky Mountain highland in Mexico is quite similar to that of the great plateau...
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Educational Technology Clearinghouse: Maps Etc: South American Heat Belts, 1901

For Students 9th - 10th
A map from 1901 of the Heat Belts in South America showing the Heat Equator in July, regions where it is always hot, regions of temperate winters and hot summers, and regions where it is always temperate. "There is comparatively little...
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Etc: Maps Etc: Heat Belts in South America, 1898

For Students 9th - 10th
A map from 1898 of the Heat Belts in South America showing the Heat Equator in July, regions where it is always hot, regions of temperate winters and hot summers, and regions where it is always temperate. "There is comparatively little...
Graphic
Curated OER

Wikipedia: Stream

For Students 9th - 10th
This article presents information on streams and various terminology associated with streams. In the article, the difference between intermittent and blue-line streams are discussed. Also, the difference between first-, second-, third-,...
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Ucar: About Temperature

For Students 9th - 10th
This site from the University Corporation of Atmospheric Research provides a lengthy page covering numerous topics including the difference between heat and temperature, the use of different temperature scales, thermal expansion, how a...
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Orchestral Natural Horn

For Students 9th - 10th
Arizona State's descriptions of the horn are broken up by illustrations of the horn, players, and music. There is a big discussion of crooks (not the kind that go to jail), but the kind that are made when you bend metal! The author notes...
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Cor Solo

For Students 9th - 10th
Arizona State's descriptions of the horn are broken up by illustrations of the horn, players, and music. There is a big discussion of crooks (not the kind that go to jail), but the kind that are made when you bend metal! The author notes...
Graphic
Curated OER

Perseus: The Greek City States and Religious Festivals

For Students 9th - 10th
Discusses the difference between modern and ancient Greek Olympic games, and goes into depth about the religious festivals that took place. Additional links to related material.

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