a) 400 : 25
400 | 25 25 | 16 --- 150 150 --- 0
16 : 5 = 3 (остаток 1)
3 + 40 = 43
43 : 12 = 3 (остаток 7)
3 + 190 = 193
б) 700 - 20 = 680
680 | 4 4 | 170 --- 28 28 --- 00 0 --- 0
170 : 2 = 85
85 | 17 85 | 5 --- 0
5 + 480 = 485
в) 420 : 14
420 | 14 42 | 30 --- 0
30 : 6 = 5
5 + 120 = 125
125 : 25 = 5
5 + 8 = 13
г) 320 + 240 = 560
560 | 80 560 | 7 --- 0
7 - 50 = -43
-43 - 60 = -103
-103 : 29 = -3 (остаток -16)
Ответ: а) 193; б) 485; в) 13; г) -3 (остаток -16).