# Pre-algebra

Khan Academy Course , Prof. Salman Khan

### Lecture 1: Negative numbers introduction

##### Lecture Details :

Mysterious negative numbers! What ARE they? They are numbers less than zero. If you understand the nature of below zero temperatures, you can understand negative numbers. We'll help.

Pre-Algebra on Khan Academy: No way, this isn't your run of the mill arithmetic. This is Pre-algebra. You're about to play with the professionals. Think of pre-algebra as a runway. You're the airplane and algebra is your sunny vacation destination. Without the runway you're not going anywhere. Seriously, the foundation for all higher mathematics is laid with many of the concepts that we will introduce to you here: negative numbers, absolute value, factors, multiples, decimals, and fractions to name a few. So buckle up and move your seat into the upright position. We're about to take off!

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##### Course Description :

Negative numbers introduction - Adding/subtracting negative numbers - Multiplying and dividing negative numbers - Adding and subtracting fractions - Multiplying fractions (old) - Dividing fractions - Introduction to order of operations - Order of operations: PEMDAS - Exponents - Negative exponent intuition - Exponent rules - Simplifying radicals - Introduction to Logarithms - Unit conversion within the metric system - Speed translation - Introduction to logarithm properties - Introduction to scientific notation - Scientific notation examples - Introduction to ratios - Unit conversion word problem: drug dosage - Common divisibility examples - Binary Numbers - Binary, Decimal and Hexadecimal Number Systems - Number Base Conversion Practice - Significant figures - More on significant figures - Multiplying and dividing with significant figures - Addition and subtraction with significant figures - Pure Numbers and Significant Digits - Ordering negative numbers - Comparing absolute values - Comparing and ordering fractions - Inverse property of multiplication - Inverse property of addition - Interpreting linear graphs word problems example

##### Other Resources

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