# Secondary Catalogue

## Series: Mathematics

### 2-Step Problems

In this video we'll learn how to do 2-step problems, which ask us to solve one simple equation, and then take the value we found for the variable and plug it into another expression in order to find the value of the expression.

### 60°, 30°, 90°, 45° Angles

This programme shows students how to construct 60° and 90° angles using a compass and ruler and then how derive 30° and 45° angles by bisecting each of them respectively.

### Absolute and Conditional Convergence

Learn how to determine whether the series converges absolutely or conditionally using the ratio and root tests.

### Abstract Vector Spaces

What is a vector space? Even though they are initial taught in the context of arrows in space, or with vectors being lists of numbers, the idea is much more general and far-reaching.

### Accuracy: Continuous Data

In this video, the teacher demonstrates how to identify the maximum and minimum possible values of a number that has been rounded, and how to identify upper and lower bounds for continuous data.

### Accuracy: Discrete Data

In this video, the teacher demonstrates how to identify the maximum and minimum possible values of a number that has been rounded, and how to identify upper and lower bounds for discrete data.

### Adding a Constant

This video shows students what adding a constant does to a graph. It shows the result of adding a positive or negative constant inside or outside the brackets of a parabola or cubic graph.

### Adding and Subtracting Algebraic Fractions

This video shows students how to add or subtract algebraic fractions, by first factorising the numerator and denominator in order to simplify the fractions and find the lowest common denominator.

### Adding and Subtracting like Terms

In this video we'll learn how to add and subtract like terms. When we're adding or subtracting, like terms are terms in which both the base and the exponent are the same.

### Adding and Subtracting Polynomials

In this video we'll learn how to add polynomials together and subtract polynomials from one another. We'll do this by combining like terms, which will be terms with the same base and the same exponent, since we're doing addition and subtraction.

### Adding and Subtracting Radicals

In this video we learn how to add and subtract radicals, or square roots. We can only add together or find the difference of square roots when they are the square roots of the same number.

### Adding Mixed Measures

In this video we learn how to add mixed measures. Specifically, we learn how to add hours, minutes and seconds, and yards, feet and inches.

### Adjacent and Nonadjacent Angles

In this video we'll define adjacent angles and identify adjacent and non-adjacent angles. Adjacent angles must share a vertex and one side, and must not have any of the same interior points.

### Algebra

A mobile phone deal and a trip to the cinema are used to explain algebra.