Question

a, 64 . 6 + 81 . 4 + 17 . 6

b, 930 / 15 + 310 / 5 + 196 

c, 572 / 26 - 156 / 13

Answer 1

a,64.6+81.4+17.6
=6(64+17)+81.4
=6.81+81.4
=81(6+4)
=81.10
=810

Answer 2

\(a:\)\(64.6+81.4+17.6\)

\(=\left(64+17\right).6+81.4\)

\(=81.6+81.4\)

\(=81.\left(6+4\right)\)

\(=81.10\)

\(=810\)

Answer 3

\(b:\)\(\frac{930}{15}+\frac{310}{5}+196\)

\(=\frac{310}{5}+\frac{310}{5}+196\)

\(=124+196\)

\(=320\)

Answer 4

\(c:\)\(\frac{572}{26}-\frac{156}{13}\)

\(=\frac{286}{13}-\frac{156}{13}\)

\(=\frac{130}{13}\)

\(=10\)