How to calculate (25 + 7) × 40?
How simple is 25 times 14 times 40 times 5
(25*40) *(14*5)
=1000*70
=70000
4.8 times 0.25 simple operation? 0.78 times 98 simple operation?
0.78×98
=0.78×100-0.78×2
=78-1.56
=76.44