True, 672 + 200 = 872, 678 + 100 = 778, 787 + 100 = 887, 683 + 300 = 983, 517 + 300 = 817, False, 766 + 200 = 235, 750 + 100 = 540, 334 + 500 = 106, 209 + 400 = 479, 547 + 200 = 919

Three digit addition practice

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