How to work out Surface area Instantly. @tecmath

Uploaded October 2022 | Updated September 2026, 2 weeks ago

This trick allows you to work out the surface area almost instantly of ANY rectangular prism (or box). How do you work out the TSA (total surface area) of a box - watch this video and you'll be able to do it instantly!

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$Convert Fractions to Percentages Mentally Convert Fractions to Percentages sometimes.....not always possible! This video is part of a playlist: https://www.youtube.com/playlist?list=PLjbxBzUM6SLnSYop8JXLu9zciW-rn7yyD To support tecmath making new math videos on Patreon: https://www.patreon.com/tecmath To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU To support tecmath on Patreon: https://www.patreon.com/tecmath To buy tecmath mechandise: https://teespring.com/stores/tecmath-store #fastmathtricks #mentalmath #mathtrick #fractions #fraction #fractionsmath$

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