Round the number to the place of the underlined digit of 2 ( 253), 300, 200, Round the number to the place of the underlined digit of 4 ( 542), 540, 500, Round the number to the place of the underlined digit of 2 ( 26,577,091), 20,000,000, 30,000,000, Round the number to the place of the underlined digit of 0 ( 499,091), 499,000, 499,100, the sum of 492,763,800 + 64,054,637 =, 556 ,818,437, 556,800,407, the sum of 225,947,384 +687,036,254 =, 900,801,638, 912,983,638, the sum of 74,126,837 + 8,935,026=, 80,006,638, 83,061,863, the sum of 568,262,783 + 4,851,407=, 573,114,190, 507,114,200, the sum of 25,719 + 4892 + 9305 =, 39,916, 45,916, the sum of 255 + 8065 + 2177 + 3 =, 500,200, 10,500, the sum of 42,650 + 843 + 5,491 + 68=, 50,555, 49,052, the sum of 5466 + 1409 + 4686 =, 11,561, 12 ,562, The difference of 5829 - 946 =, 4883, 9882, The difference of 64,285 - 7,597 =, 55,888, 56,688, The difference of 6347 - 659=, 7688, 5688, The difference of 25,328 - 8530=, 16,798, 27,897, The difference of 4000 - 891=, 1190, 3109, The difference of 8000 - 1235 =, 7655, 6765, The difference of 4000 - 2945 =, 1055, 5501, The difference of 900,000 - 9568 =, 890,432, 980 ,209, 47 ,940 ⩻ 47,980, True, False, 44,700,002 ⩼ 48,800 ,000, True, False, `791,403,236 ⩼ 791,480,135, True, False, 536,024 ⩻ 556 ,025, True, False, the standard form of 30,000 + 2000 + 400 +60 +1, 32,461, 30,246 ,001, the standard form of 2000 + 50 +2 =, 200502, 2052, the standard form of 5,000,000,+ 30,000 + 5000+ 300 + 10 +4 =, 5,035,314, 5,004,3114, the standard form of 6,000,000 + 20 =, 600000000200, 6000020

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