# Calculations for Binary and Decimal Number Conversions

﻿How do you convert a binary number, (which uses only digits zeros(0) and ones (1) as numbers to count quantities), to a decimal number (which uses digits zero (0) to nine (9) to count quantities)? Reference : https://www.cuemath.com/numbers/decimal-to-binary/ Videos : CS50 2022 Introductory Lecture (Harvard U) @ 35 min 20s on using numbered light switches Khan Academy video on Introduction to Numbers Systems and Binary Numbers (longer)﻿ This resource can be used for numbers up to 16383, to learn how to convert values between these number systems. Do your own practice by choosing a few numbers of each type, and then working out the conversions on a piece of paper, before checking your answers.

## Fun with Numbers

﻿Check out this fun magic trick you can play with your unsuspecting friends and show them how you can read their minds. https://www.geogebra.org/m/TUb28BMF by Brad Ballinger Contains the pdf and images for printing out the physical cards and playing out the counting.