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Activity
Lawrence Hall of Science

The Math Page: Skill in Arithmetic: Percent of a Number

For Students 3rd - 8th
This Math Page tutorial explains how to find the percent of a number and features a practice to check comprehension.
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Interactive
Visual Fractions

Visual Fractions: Add Fractions With Number Line or Circle Models

For Students 3rd - 8th Standards
This site is provided for by Visual Fractions. Add mixed numbers with like denominators using circles. Click on the "Explain" button to understand the answer.
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Unit Plan
AAA Math

Aaa Math: Adding Mixed Numbers With the Same Denominator

For Students 9th - 10th Standards
This site explains how to add mixed numbers that have the same denominator, and includes games to practice this skill.
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Unit Plan
AAA Math

Aaa Math: Subtracting Mixed Numbers

For Students 3rd - 8th Standards
This site explains how to subtract mixed numbers that have the same denominators. The site provides games to practice this skill.