Respuesta :

kittymaniac
To do this without a calculator, it may be easier to break the number into smaller parts.
420 * 6
= (400 * 6) + (20 * 6)
= 2400 + 120
= 2520

Hope this helps! :)
2520 is the answer because adding 420 repeatedly 6 times has to be divisible by six(and I did the multiplying too) so the answer was obviously six.