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 ...