Math Is Fun
Math Is Fun: Mathematical Models
Provides a good discussion of how and why models are used in Mathematics to represent problems in the real world. It explains different ways to model a problem, e.g., with a formula or an illustration, and what can be learned from them....
Khan Academy
Khan Academy: Classify Complex Numbers
Classify numbers as real, pure imaginary, or complex. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Lawrence Hall of Science
The Math Page: Skill in Algebra: Skill in Algebra: Complex or Imaginary Numbers
Clearly and thoroughly explains complex numbers. Provides example problems and exercises for students, with solutions available.
CK-12 Foundation
Ck 12: Algebra: Formulas for Problem Solving
[Free Registration/Login may be required to access all resource tools.] Learn to use formulas to solve problems.
CK-12 Foundation
Ck 12: Physical Science: Significant Figures
[Free Registration/Login may be required to access all resource tools.] Determining significant figures and rounding.
CK-12 Foundation
Ck 12: Algebra: Comparison of Problem Solving Models
[Free Registration/Login may be required to access all resource tools.] Use the strategies of making a table and looking for a pattern to solve problems.
BBC
Bbc Skillswise: Measuring: Length and Distance
Activities to practice length and distance measuring.
BBC
Bbc Skillswise: Measuring: Imperial and Metric
Activities to learn about imperial and metric measures.
University of Cambridge
University of Cambridge: Maths and Sports: Speed and Accuracy
This activity investigates the importance of accurate measurement in competitive sport, looking at examples from athletics and swimming. It is aimed at secondary maths students (grades 8, 9, and 10).
BBC
Bb Ci: Review Significant Digits
BBCi presents a test prep review ("revision") section on significant digits and on approximating an answer by rounding in order to work with an easy number. Click on "Test Bite," on the last page to get an interactive quiz.
CK-12 Foundation
Ck 12: Measurement: Appropriate Tools for Metric Measurement
[Free Registration/Login may be required to access all resource tools.] Choose appropriate metric measurement tools when finding various lengths.
Alabama Learning Exchange
Alex: Float or Sink?
Students will define density and use the density formula to determine the density, volume, and mass of various items using the correct units for each measurement.
Khan Academy
Khan Academy: Absolute Value of Complex Numbers
Given a complex number in the form a+bi, find its absolute value.
Illustrative Mathematics
Illustrative Mathematics: Complex Distance
This problem is intended to reinforce the geometric interpretation of distance between complex numbers and midpoints as modulus of the difference and average respectively.
Khan Academy
Khan Academy: Basic Normal Calculations
Many measurements fit a special distribution called the normal distribution.
Khan Academy
Khan Academy: Simplify Roots of Negative Numbers
Rewrite square roots of negative numbers as imaginary numbers.
Khan Academy
Khan Academy: Classify Complex Numbers
Classify numbers as real, pure imaginary, or complex.
Cuemath
Cuemath: Introduction to Surface Area
A comprehensive guide for learning all about surface area with definitions, why it is important to know, solved examples, and practice questions.
Khan Academy
Khan Academy: Parts of Complex Numbers
Determine the real and the imaginary parts of complex numbers.
Khan Academy
Khan Academy: Powers of the Imaginary Unit
Simplify expressions with base i (the imaginary unit) raised to a positive exponent.
Khan Academy
Khan Academy: Add & Subtract Complex Numbers
Practice addition and subtraction with complex numbers.