What video is he talking about?

In the video “All Arithmetic Mega Practice” @1:04:04 (link:All Arithmetic - Mega Practice - GregMat), Greg says there’s a trick to solve that question. Can somebody help me find it?!

Thanks mate! :slight_smile:

The video titled “factors and multiples” around the 16th minute mark

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Thanks Vidisha! You’re awesome! :smiley: