Wolfram Alpha is an online service that answers factual queries directly by computing the answer from externally sourced "curated data", rather than providing a list of documents or web pages that might contain the answer as a search engine might.
Photomath is a mobile application described as a "camera calculator", which utilizes a phone's camera to recognize mathematical equations and to display the step-by-step solution onscreen.
Khan Academy is a non-profit educational organization created in 2008 by Salman Khan with the goal of creating a set of online tools that help educate students. The organization produces short lessons in the form of videos. Its website also includes supplementary practice exercises and materials for educators.
Introduction to the Math Centre
The 11 Basic Rules of Math
Compound Interest and Single Equivalent Payment
Calculating an Annuity
Use of an Interest and Annuities Formula Sheet
Similar vs. Congruent Triangles
Division of Fractions
Adding (and Subtracting) Fractions
Using Your Calculator to Calculate Fractions and Exponential Equations
Mixed and Improper Fractions
Connecting Fractions, Decimals and Percents with a Calculator
Importance of Units and Dimensions
Working with Scales
Metric Conversions: With Squares, Cubes and Volumes
Conversions with Multiple Parts
Scalar (Mass) vs. Vector (Weight)
Complex Numbers: Definitions and Descriptions: Part 1