Yale University
Yale New Haven Teachers Institute: Solving Problems "By the Hundreds"
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.
National Council of Teachers of Mathematics
Nctm: Figure This: Math Challenges for Families
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...
CK-12 Foundation
Ck 12: Arithmetic: Comparison of Ratios in Decimal Form
[Free Registration/Login may be required to access all resource tools.] Write and compare ratios in decimal form
PBS
Pbs Mathline: Is It Really News? Lesson Plan [Pdf]
Students use decimals, percents, and fractions to explore how much "news" is really in the newspaper. Printable lesson
Mangahigh
Mangahigh: Number: Find a Fraction of an Amount Simple Examples
Convert between fractions, percents, and decimals.
Other
Pep: Hit the Deck: A Collection of Math Games
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,...
ABCya
Ab Cya: Pecking Order
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...
Saddleback College
Algebra2 Go: Prealgebra
The resource consists of comprehensive learning tools such as class notes, video lectures, and templates through which students can review prealgebra topics.
Khan Academy
Khan Academy: Comparing, Order Rational Numbers
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.
CK-12 Foundation
Ck 12: Arithmetic: Decimal Addition
[Free Registration/Login may be required to access all resource tools.] Add and subtract decimals with and without rounding