Calculate values of the following private, having presented a dividend in the form of a convenient difference and having applied the rule of division of a difference into number (those examples) write down calculations

175
1) 171:9=(180-9):9=180:9-9:9=20-1=19 2) 152:8=(160-8):8=160:8-8:8=20-1=19 3)195:5=(200-5):5=200:5-5:5=40-1=39 4)203:7=(210-7):7=210:7-7:7=30-1=29
169
Answer add