I need hep with this exercise, 5610= (510+6)*10?

19a. Give reasons for each of the following steps:

56*10= (5*10+6)*10
=(5*10)*10+6*10
=5*(10*10)+6*10
=5*10^2+6*10
=5*10^2+6*10+0*1
=560

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I need hep with this exercise, 56*10= (5*10+6)*10?