round 460 + 855= - 500 + 900=, round 88 + 43 x 9= - 90 + 40 x 10= , round 12 x 56 + 1,790= - 10 x 60 + 2,000=, round 235 + 112=  - 200 +100= , round 39 + 77 x 11= - 40 + 80 x 10=, round 22 x 63 + 6,349=   - 20 x 60 + 6,000= , round 174 + 133 = - 200 + 100= , round 56 + 67 x 19=  - 60 + 70 x 20=, round 304 + 599= - 300 + 600=, round 578 + 345 x 32= - 600 + 300 x 30=,

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