80000 + 320 = 80320;
8000 + 137 = 8137;
51000 + 951 = 51951;
70338 – 338 = 70000;
70338 – 70000 = 338;
70338 – 70338 = 0;
200000 • 3 = 600000;
100000 • 8 = 800000;
600000 : 2 = 30000.