Speed Math Tip: Multiplying by 11

Mathematics has always fascinated me and I’m avid collector of Math tricks and techniques. So I’m delighted to have found out that there are lots and lots of them in YouTube.

Here’s one I found. I’ve actually learned this way back in secondary school but have since forgotten. Having viewed the video from YouTube made me recall it fully and immediately.

Here it is:

[youtube=”https://youtu.be/rckWlLZB2Eg”]

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