Ahand Mahindra's video on math hack goes viral

A new trick is going viral on Twitter right now. The clip was shared on social media by Anand Mahindra and it shows a teacher trying to explain to her students the multiplication table of 9. According to the Mahindra group Chairman, he received the video on WhatsApp. He shared the video with the caption, "Whaaaat? I didn’t know about this clever shortcut. Wish she had been MY math teacher. I probably would have been a lot better at the subject! #whatsappwonderbox."