So there is a rule about multiples of 9 in general: something is a multiple of 9 if and only if its digits add up to a multiple of 9. 6+4 = 10, so it is not a multiple of 9. There's also a neat trick to remembering the multiples of 9 below 99 with your fingers, but you can look this up if you're interested.
A product with which you end is like......um...for example:8x8=64, So 64 is the product
64 - D16, D16
10
64
64*1000 = 64000
88
(3+3+3)*(3+4)=9+12+9+12+9+12=27+36=63
A product with which you end is like......um...for example:8x8=64, So 64 is the product
64 - D16, D16
10
64
64
The answer is 8.
64 = 26
64*1000 = 64000
64
The word 'product' means 'mu;tiplication. So '64' multiplied by '2' equal;- 64 x2 128 ==== The answer!!!!!