Question

570+ 150 +430+850

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Answer 1

570+150+430+850

=(570+430)+(150+850)

=1000+1000

=1000x2

=2000

Answer 2

570+150+430+850

=[570+430]+[150+850]

= 1000 + 1000

=  2000

Answer 3

=[150+850]+[570+430]

=1000+1000

=2000

Answer 4

  570 + 150 + 430 + 850

=(570 + 430) + (150 + 850)

=1000+1000

=2000

Answer 5

217x33+217x66+217