1) What is the best estimate of 128 + 375? a) 490 b) 540 c) 510 d) None of these 2) What is the best estimate of 612 + 239? a) 840 b) 870 c) 850 d) None of these 3) What is the best estimate of 349 + 487? a) 750 b) 800 c) 900 d) None of these 4) What is the best estimate of 481 + 320? a) 800 b) 870 c) 900 d) None of these 5) What is the best estimate of 326 + 596? a) 900 b) 930 c) 910 d) None of the above 6) What is the best estimate of 721 + 138? a) 840 b) 880 c) 860 d) None of the above

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