First part: 6 x573= 6 x(500+70+3) 
Explanation: Break 573 into expanded form and multiply each place value by 6. 
Second part: (6x500)+(6x70)+(6x3) 
Explanation: Use the distributive property. 
Third part: 3000+420+18= 3438
Explanation: Solve the equations you made in part 1 & 2.
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