Номер 546

400 – 80 = 320;
210 + 90 = 300;
15 + 25 : 5 = 20;
480 – (70 + 50) = 360;
970 – (230 – 120) = 860;
100 – 2 • 2 • 8 = 68;
400 + 8 = 408;
400 – 8 = 392;
400 – 40 : 5 = 391.