108+383= 742-468= 174-88+186= 846+547=

Решение

1) 108 + 383 = (100 +300) + 80 + (8 + 3) = 400 + 80 + 11 = 491

2) 742 - 468 = (700 - 400) + (40 - 60) + ( 2 - 8) = 300 - 20 - 6 = 274

3) 144 - 88 + 186 = (144 + 186) - 88 = (100 + 100) + (40 + 80) + (4 + 6) - 88 = 200 + 120 + 10 - 88 = 330 - 88 = 200 + 130 - 80 - 8 = 200 + 42 = 242

4) 846 + 547 = (800 + 500) + (40 + 40) + (6 + 7) = 1300 + 80 + 13 = 1393

Ответы: 1) 491; 2) 274; 3) 242; 4) 1393.