584 - 485 + 100 , 788 - 778 + 10, 430 - 33 + 100 , 984 - 884 + 100, 365 - 355 + 10, 278 - 178 + 100, 843 - 833 + 10, 408 - 398 + 10, 709 - 699 + 10, 112 - 12 + 100, 404 - 304 + 100, 670 - 570 + 100, 229 - 129 + 100, 492 - 392 + 100, 501 - 491 + 10, 229 - 219 + 10, 942 - 842 + 100, 230 - 220 + 10, 510 - 500 + 10, 105 - 95 + 10,

Mental Math 3-Digit Addition

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