Simple operation of 3.4x80% + 0.8 + 80% X5.5

Simple operation of 3.4x80% + 0.8 + 80% X5.5


3.4x80%+0.8+80%x5.5
=3.4×0.8+0.8+0.8×5.5
=0.8×(3.4+1+5.5)
=0.8×9.9
=0.8×(10-0.1)
=0.8×10-0.8×0.1
=8-0.08
=7.92



Simple calculation 7.8 * 80 + 6.5


Simple calculation:
7.8*80+6.5
=7.8*(100-20)+6.5
=780-156+6.5
=780-150+0.5
=630+0.5
=630.5



Simple calculation: (8 / 7-4 / 5) × 7 / 8


(8/7-4/5)×7/8 =8/7x7/8-4/5x7/8=1-7/10=3/10