Take the number and start adding digits from right to left successivily with the next diigit.

For example 435*11=?

Take 5 and add0.1st digit=5.

then take 3 and add 5=8.

then take 4 and add 3 =7.

then take 0( as digit next to 4 is 0) and add 4=4.

so ur answer is 4785.

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