CK-12 Foundation
Ck 12: Arithmetic: Sums of Integers on a Number Line
[Free Registration/Login may be required to access all resource tools.] In this lesson students find sums of integers by using a number line. Students examine guided notes, review guided practice, watch instructional videos and attempt...
Other
Msjc: Lesson: The Opposite and the Reciprocal Assignment: The Opposite
Explore opposites and reciprocals through positive and negative numbers and fractions.
University of Canterbury
Cs Unplugged: How Binary Digits Work
Learn why we have different number systems and expolre binary digits.
Shodor Education Foundation
Shodor Interactivate: Number Base Clocks
Visually explore counting and place value with different number bases, from base 2 to base 16, and up to the hundreds place using a clock like interface. The activity also allows you to look at the numbers on the clock in base 10 or in...
Shodor Education Foundation
Shodor Interactivate: Number Base Clocks
Introduces young scholars to the concept of base ten and how to use other base number systems.
NumberNut
Number Nut: Numbers and Counting: Ten Shapes Make the Numbers
A brief introduction to the idea that all numbers in our system of arithmetic are made up of the ten different symbols from zero to nine.
NumberNut
Number Nut: Numbers and Counting: Numeric Symbols
Briefly describes some of the ways that numbers can be represented, including using a few other number systems, such as Roman and Mayan.
University of Cambridge
University of Cambridge: Nrich: Number Detective
On this one page website sharpen your logic and place value skills while working on this challenge. The solution is available to double check your solution.
National Institute of Educational Technologies and Teacher Training (Spain)
Ministerio De Educacion: El Sistema Decimal De Numeracion
Practice your knowledge of different number systems with the interactive example then check your knowledge with the different exercises.
Wikimedia
Wikipedia: Rational Numbers
Learn the definition of rational numbers. You can also look at some examples and properties, plus learn about Egyptian fractions. Links are provided for additional information.