Addition & Subtraction of Numbers of different Bases other than Base 10

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Videos I & II
Courtesy: Tambuwal Maths Class
https://www.youtube.com/channel/UCYxAOG6Kz3t_haF45jYPFPQ

Video I - Addition

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Video II - Subtraction

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Video III - Addition & Subtraction
Courtesy: The Organic Chemistry Tutor
https://www.youtube.com/channel/UCEWpbFLzoYGPfuWUMFPSaoA

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Worksheets 
Courtesy: Math Drills
​https://www.math-drills.com
https://www.math-drills.com/multiop.php

Worksheet # 1

Worksheet # 2

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