Anand Mahindra shared a math trick that impressed Shah Rukh Khan. Anand Mahindra reached into his famous 'WhatsApp Wonder Box' yet again - this time to share a clever multiplication hack with his 7 ...

What are you like at multiplications? Chances are if you're a mere mortal 2, 5s and 10s won't seem too taxing. But when it comes to figuring out what 42x21 is, you may wish somebody had shown you the ...

Anand Mahindra's tweet has a short video clip, wherein a school teacher describes a clever shortcut to multiply various numbers by nine -- to be more precise, a hack to remember the table of nine.