____+ 500=700
500+600=1.100
____+ 250 = 873
300 + ______ = 700
345+256=601
677+___=873
670+ 329=999
600+500=1.100
______+ 400 = 700
200+____= 700
329+670=999
___+196=873
623+___=873
256+345=601
