1. 213 = 200+ 10+ 200+ 13 =□ 300 + 60 + 3 296-90-6 509-500 900+20 704-80 654-54 860-7 435-30

1. 213 = 200 + 10 + 3
200 + 13 = 213
300 + 60 + 3 = 363
296 - 90 - 6 = 200
509 - 500 = 9
900 + 20 = 920
704 - 80 = 624
654 - 54 = 600
860 - 7 = 853
435 - 30 = 405