Estimate 2598 to the nearest 100, 2600, 2500, 2590, Round off 455 to the nearest 10, 450, 460, 440, Estimate the sum of 32 and 45 , 70, 77, 80, Estimate:673 - 322, 500, 400, 300, Estimate the product of 22 and 47, 800, 900, 1000.

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