(- 81) divided by 2 and 1 / 4 by 4 / 9 by (- 1 / 16)

(- 81) divided by 2 and 1 / 4 by 4 / 9 by (- 1 / 16)

(- 81) divided by 2 and 1 / 4 by 4 / 9 by (- 1 / 16)
=(- 81) * 4 / 9 of 9 * (- 1 / 16)
= -36*4/9*(-1/16)
= -16*(-1/16)
= 1

Simple calculation method of 0.279 * 343 + 0.657 * 279

0.279*343+0.657*279
=0.279*343+0.279*657
=0.279*（343+657）
=0.279*1000
=279

Simple calculation of 0.279 * 343 + 0.657 * 279

0.279*343+0.657*279
=0.279*343+0.657*0.279*1000
=0.279x(343+0.657x1000)
=0.279x1000
=279
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0.279*468+0.657*279-1.25*27.9

0.279*468+0.657*279-1.25*27.9
0.279*468+657*0.279-125*0.279
=0.279*(468+657-125)
=0.279*1000
=279