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This YouTube video introduces Grade 8's / Form 1's to the basics of fractions.

This video explains how to order fractions by their size.

Unpacking the concept of writing fractions in the simplest form.

Introduction to passive and active transport

Food webs are models that demonstrate how matter and energy is transferred between producers, consumers, and decomposers as the three groups interact within an ecosystem. Transfers of matter into and out of the physical environment occur at every level. Decomposers recycle nutrients from dead plant or animal matter back to the soil in terrestrial environments or to the water in aquatic environments. The atoms that make up the organisms in an ecosystem are cycled repeatedly between the living and nonliving parts of the ecosystem.

Mitosis, meiosis and sexual reproduction. Understanding gametes, zygotes, and haploid / diploid numbers.

The Calvin Cycle or the light-independent (dark) reactions of photosynthesis.

YouTube video that explains how to use prime factorization to find the highest common factor and lowest common multiple. It is very simple using the method described in the video.

Part 1: Proper, improper and mixed fractions
Part 2: Examples of proper, improper and mixed fractions
Part 3: Common mistakes and misconceptions

This video explains how to solve algebraic fractions.