245 + 310 =, 555, 760 − 405, 355, 509 + 280 =, 789, 900 − 445 =, 455, 138 + 462 =, 600, 850 − 125 =, 725, 321 + 478 =, 799, 1000 − 670, 330, 599 + 101 =, 700, 430 − 210 =, 220.

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