28 times 560 plus 44 times 12.8 and 2.5 times 3.2 times 12.5 are calculated by simple method
1.28*560+44*12.8
From the figure, we can see that 12.8 is ten times of 1.28
So conversion:
=12.8*56+44*12.8
=(56+44)*12.8
=128
Second question
2.5*3.2*1.25
=2.5*4*(0.8*1.25)
=10