672-36+64
=600+72+64 -36
=600+136-36
=700
1034+78+320+102
=1034+300+20+78+102
=1034+300+200
=1534
25+75-25+75
=25-25+75+75
=75+25+50
=150
127+133+184+240
=127+33+100+240+184
=260+240+184
=500+184
=684