567+3=570
439+1=440
560-9=551
2+678=680
6+324=330
900-7=893
⇄ 1) 567 + 3 = 570
⇆ 2) 439 + 1 = 440
⇄ 3) 560 - 9 = 551
⇆ 4) 2 + 678 = 680
⇄ 5) 6 + 324 = 330
⇆ 6) 900 - 7 = 893
567+3=570
439+1=440
560-9=551
2+678=680
6+324=330
900-7=893