____ + 230 = 570 830 - ____ = 480 ____ - 125 = 500 640 = ____ + 390 Estimate: 487 + 312 = ____ ____ + 158 = 142 600 - ____ = 250 740 = 500 + ____ Estimate 289 + 506 = ____ ____ - 210 = 620

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