round 46 + 85= - 50 + 90=, round 88 + 43= - 90 + 40= , round 12 + 56= - 10 + 60=, round 235 + 112=  - 200 +100= , round 39 + 77= - 40 + 80=, round 22 + 63= - 20 + 60= , round 17 + 13= - 20 + 10= , round 56 + 67= - 60 + 70=, round 304 + 599= - 300 + 600=, round 578 + 345= - 600 + 300=,

Round to Estimate Sum

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