1. http://mathforum.org/dr.math/faq/faq.pri...
   Prime Numbers-- Ask Dr. Math provides responses to frequently asked questions about prime numbers. This site also explains the Sieve of Eratosthenes for identifying prime numbers.
    
2. http://www.aaamath.com/B/g21e_px1.htm...
   Place Value in Words and Numbers -- Type the correct numeral to represent the words
    
3. http://mathforum.org/paths/fractions/oly...
   Fractions in the Olympics is a game that encourages students to add fractions with different denominators.
    
4. http://www.aaamath.com/B/g6_31_x1.htm...
   Place Value-- When given a numeral, identify the place value of the digits
    

1. http://www.funbrain.com/cashreg/index.ht...
   "Change Maker" This is a game in which a student attempts to accumulate as much as money as possible in the piggybank. The student determines how much change he/she is entitled to receive when making a purchase. The game can be played at different difficulty levels and using the currency of different countries.
    
2. http://www.pbs.org/teachersource/mathlin...
   How Big Is Big-- Good activity for pairs of students to discuss and fill out a .pdf sheet that can be printed. Develop an understanding of large numbers, including benchmarks to comprehend their magnitude; recognize, understand, and appropriately use various representations for large numbers (e.g., exponential, scientific, and calculator notation).
    
3. http://score.kings.k12.ca.us/lessons/eat...
   Eating on a Budget introduces the students to estimation on a grade 5 and 6 level. The learners will be required to estimate, add, and subtract to stay within a budgeted amount.
    
4. http://www.realityeducation.com/realless...
   Real World Sample Lesson Plan-- Balancing a Checkbook is a lesson that provides students with the opportunity to use math skills in real world situations. Students will practice the addition/subtraction of decimals as they balance a checkbook.
    

1. http://www.eduplace.com/math/mathsteps/6...
   Writing and Solving One-step Linear Equations in One Variable provides instruction in using inverse operations to solve equations at Math Steps.
    
2. http://www.math.com/school/subject2/less...
   Solving Addition and Subtraction Operations is a Math.com site that provides clear information on solving equations. The site provides indepth information, examples and worksheets.
    
3. http://www.shodor.org/interactivate/acti...
   Math Activities is a site that has a large collection of online activities for grades 6 through 8 that address the Terra Nova objective, operation concepts.
    

1. http://www.harcourtschool.com/activity/c...
   Measurment Equivalents-- Match game with standard equivilant measurements, such as pounds, ounces, pints, cups, etc.
    
2. http://www.shodor.org/interactivate/acti...
   Area Explorer - Students are shown shapes on a grid after setting the perimeter and asked to calculate areas of the shapes
    
3. http://www.aaamath.com/mea316-hours-minu...
   Converting Time Units is a practice site that reviews how to find hours and minutes when the number of minutes is known. It also provides timed practice for students. The student is timed and receives a report of the percentage correct and the amount of time required to complete the practice.
    
4. http://www.shodor.org/interactivate/acti...
   Math Activities is a site that has a large collection of online activities for grades 6 through 8 that address this Terra Nova objective.
    

I would also suggest using the software Geometer's Sketchpad.
 

1. 5.6.7.8 sites were down.
2. http://mathforum.org/geopow/...
   Geometry Problem of the Week--A new problem is presented each week reinforcing objectives in geometry. I post them in class, and let students propose solutions before returning to the site to check the answers. Students learn practical applications of geometry.
    
3. http://www.pbs.org/teachersource/mathlin...
   The Geometry of Bicycle Design-- This site challenges students to investigate and design bicycles. Students will measure lengths and angle and make conjectures about angle sizes and types. Designated for grades 3 through 5 but suitable for grade 6 also. of bicycles. Objective: The student will design a bicycle based on the specific purpose of their choice using triangles, and measuring angles and lengths.
    
4. http://people.uncw.edu/sherrilld/EDN356/...
   Feature Analysis Chart for Math is a chart that has students analyze geometric shapes and determine their differences and similarities.
    

1. http://www.bbc.co.uk/schools/revisewise/...
   Mode, Mean, Median - Interactive lesson followed by activities - (UK measurements)
    
2. http://www.glencoe.com/sec/math/studytoo...
   Collecting and Analyzing Data-- This is a short online quiz to check their skills in data analysis.
    
3. http://www.shodor.org/interactivate/acti...
   Circle Graph - Enter data categories and the value of each category to create a circle graph (similar to "Pie Chart" but the user can define the data set)
    
4. http://www.shodor.org/interactivate/acti...
   Marbles - Students learn about sampling with and without replacement by modeling drawing marbles from a bag. Parameters: Number and color of marbles in the bag, replacement rule.
5. site  down
    

1. http://www.shodor.org/interactivate/acti...
   Positive Linear Function Machine - Students investigate linear functions with positive slopes by trying to guess the slope and intercept from inputs and outputs.
    
2. http://yn.la.ca.us/cec/cecmath/cecmath.2...
   "Improving Deductive Reasoning Skills" The purpose of this unit is to enhance student problem solving strategies and increase student ability to solve deductive reasoning problems. Deductive reasoning skills are particularly useful when students are dealing with number patterns.
    
3. http://math.rice.edu/~lanius/Lessons/cno...
   Calendar Math Puzzle-- Students will access this site to use a fun mathematical puzzle to demonstrate solving a simple linear equation.
    
4. http://www.mathleague.com/help/algebra/a...
   Introduction to Algebra is a web site that provides explanations of algebraic terms, examples and links to math contests. It also provides links to challenging math practice and educational software related to algebra.
    

1. http://www.col-ed.org/cur/math/math29.tx...
   "Problem Solving---A Part of Everyday Thinking" Many students view problem solving, its process, and necessary skills as that task assigned by the teacher. They have not gotten into the habit of critically reviewing every recommendation and decision they make before executing on it. Therefore, the act of critically thinking through every significant idea that comes to mind is viewed as playing a very minor role in their daily lives.
    
2. http://www.aaamath.com...
   AAA Math is a web site that provides links to all aspects of algebra from exercises, help sites and software links.
    
3. site down