1) (524+397) - 224 = (524-224) + 397 = 697
2) (817+651) - 351 = 1.117
3) 877 - (377+216) = (877-377) - 216 = 284
4) 972 - (149+472) = 351
1) (524+397) - 224 = (524-224) + 397 = 697
2) (817+651) - 351 = 1.117
3) 877 - (377+216) = (877-377) - 216 = 284
4) 972 - (149+472) = 351