NSN - Basic Number Properties
Purplemath There are three basic properties of numbers, and your textbook will probably have just a little section on these properties, somewhere near the beginning of the course, and then you'll probably never see them again (until the beginning of the next course). My impression is that covering these properties is a holdover from the "New Math" fiasco of the 1960s. While the topic will start to become relevant in matrix algebra and calculus (and become amazingly important in advanced math, a couple years after calculus), they really don't matter a whole lot now.

Fun Kids Online Math Games
"Sheppard offers everything from early math to pre-algebra. The lessons include interactive activities to practice concepts. Students can shoot fruit, pop balloons, and even play math man (the math version of pac man!).
Mangahigh - Maths Games
1. Maths Coverage Mangahigh is a comprehensive and powerful maths teaching resource offering full coverage of the UK National Curriculum with more than 400 different challenges ranging from addition to quadratic factorisation 2. Adaptivity
Difference Between a Percentage and a Rate (as explained by medical field)
Often we hear the question, "What is the difference between a percentage and a rate?" They are both calculated using a numerator and a denominator. However, the relationship between the numerator and denominator makes the difference. Percentages

2048
Join the numbers and get to the 2048 tile! New Game How to play: Use your arrow keys to move the tiles. When two tiles with the same number touch, they merge into one!
Math Trainer - Times Tables
Get in some serious math training. Responds to your answers, so it trains your weaknesses. Train yourself to remember, don't count (the cutoff time helps with this) New Version!
Free materials
Free Samples: Now is your chance to try TouchMath products at absolutely no charge to you! We are committed to ensuring that you choose the most appropriate TouchMath materials for your students before you invest a single penny in our products. Select from the list below to view and download as many free samples as you'd like for use with your students.

NSN - Fractions, Ratios, Rates, and Percents Explained
What's the difference between a fraction and a ratio? A fraction is a number that names part of a whole or part of a group. The denominator represents the total number of equal parts the whole is divided into.
Math Vocabulary Cards by The Math Learning Center
What Is It? The Math Vocabulary Cards app helps students deepen their conceptual understanding of key terms in mathematics. Each card features three sections: a math term, a representative example or model, and a concise definition. Each section can be hidden or revealed providing multiple options for practice.
NSN - Integers - reason why two negatives make a positive
Here are ‘The Rules’ and ‘The Reasons’, ‘The How’ and ‘The Why’ for Multiplying Integers. I uploaded a couple pages of my Math Model Book for a ‘Pair-a-Dimes’ post, “Assessment & Rote Learning: Math Conundrums“… and thought I would share these very practical resources here.

Bridges First Edition Support
If your child is using Bridges Grade 1, you may find the resources below helpful. What Your First Grader Will Learn (PDF) Your child’s teacher may use the Math Skills & Concepts Student Report to communicate with you about how your child is doing in math class. This report is meant to provide an overall picture of your child’s progress at a given point in the year. It does not include every skill or idea your child will study in math class.
Students
Youcubed for Students Four Boosting Math Messages from Jo and Her Students Elisa’s Story Brandon’s Story