Activity
Yale University

Yale New Haven Teachers Institute: Solving Problems "By the Hundreds"

For Teachers 9th - 10th
The Yale-New Haven Teachers Institute site contains various math exercises relating to percentage and consumer-related problems. An explanation of sales tax, a related problem and answer are given.
Activity
National Council of Teachers of Mathematics

Nctm: Figure This: Math Challenges for Families

For Students 2nd - 8th
Students, teachers, and parents alike will enjoy this challenging math site. It contains a clever brain teaser section plus creative problems related to algebra, geometry, measurement, numbers, statistics, and probability. A Spanish...
Unit Plan
CK-12 Foundation

Ck 12: Arithmetic: Comparison of Ratios in Decimal Form

For Students 7th
[Free Registration/Login may be required to access all resource tools.] Write and compare ratios in decimal form
Lesson Plan
PBS

Pbs Mathline: Is It Really News? Lesson Plan [Pdf]

For Teachers 6th - 8th
Students use decimals, percents, and fractions to explore how much "news" is really in the newspaper. Printable lesson
Interactive
Mangahigh

Mangahigh: Number: Find a Fraction of an Amount Simple Examples

For Students 5th - 8th
Convert between fractions, percents, and decimals.
Professional Doc
Other

Pep: Hit the Deck: A Collection of Math Games

For Teachers K - 1st
This is a collection of math games ranging from Kindergarten to the upper elementary grades, using only an ordinary deck of playing cards. There are games covering addition, subtraction, multiplication, division, fractions, percents,...
Interactive
ABCya

Ab Cya: Pecking Order

For Students 3rd - 6th
Pecking Order is an educational game for kids to practice number values with fractions, percents, and decimals. The object of the game is to arrange the different birds from least to greatest on a number line as quickly as possible...
Unit Plan
Saddleback College

Algebra2 Go: Prealgebra

For Students 9th - 10th Standards
The resource consists of comprehensive learning tools such as class notes, video lectures, and templates through which students can review prealgebra topics.
Unit Plan
Khan Academy

Khan Academy: Comparing, Order Rational Numbers

For Students 6th - 8th Standards
Practice comparing decimals, percents, fractions, and mixed numbers. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Unit Plan
CK-12 Foundation

Ck 12: Arithmetic: Decimal Addition

For Students 8th
[Free Registration/Login may be required to access all resource tools.] Add and subtract decimals with and without rounding