x # Pre-algebra

Khan Academy, , Prof. Salman Khan

Updated On 02 Feb, 19

##### Overview

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

## Lecture 1: Negative numbers introduction

4.1 ( 11 )

###### 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. Well help.

Pre-Algebra on Khan Academy No way, this isnt your run of the mill arithmetic. This is Pre-algebra. Youre about to play with the professionals. Think of pre-algebra as a runway. Youre the airplane and algebra is your sunny vacation destination. Without the runway youre 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. Were about to take off!

About Khan Academy Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. Weve also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

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25 Ratings
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Excellent course helped me understand topic that i couldn't while attendinfg my college. 