Mike changes tires on different vehicles.  He changes all the tires on 12 motorcycles and all the tires on 10 cars.  How many tires did he change?
How many motorcycle tires did Mike change? ** He changed 12*2=<<12*2=24>>24 motorcycle tires
How many car tires did Mike change? ** He changed 10*4=<<10*4=40>>40 car tires
How many tires did Mike change? ** So he changed 24+40=<<24+40=64>>64 total tires
#### 64