1. 34-78= 34000-78=339222.45-12=450-12=4383.1-1200=1000000-1200=9988004.221-120=2210-120=20905.5-26=5000-26=49746116-34=1160000-34=11599667.32-61=32000-61=31398.41-41=4100-41=40509.78-789=7800-789=700110.23-7600=23000-7600=1540011.769-670=7690-670=702012. 4531+78643=453100+78643=531743