Addition and Subtraction Show What You Know #1
423-198= 325 198 225 375 237+450= 687 787 677 287 127+256 371 374 383 384 850-229= 621 639 631 521 647+110= 537 757 737 777 350-118+ 228 132 242 232 456+263= 619 713 729 719 689-299= 390 290 410 490 156+223= 373 279 389 379 537-212= 225 325 215 315