Question

a)      (-4).(-3).25.(-8)                     b)     7.(– 25).(– 3)².(– 4)            

d)   [ 93–( 20–7 )]:16                   e)    53 – (–51) + (-53) + 49  f)  168 – (49) + (-68) + 4

g) 53 – (–7) + (-53) – 49            h)    25.(- 124) + 124. 25             i)      (-11).36  - 64.11                                 k)  125.(- 24) + 24.125                l)    125.(-23) + 23.225              m) (-11).36  + 64.(- 11)

Answer 1

\(a,\left(-4\right).\left(-3\right).25.\left(-8\right)\)

\(=12.25.\left(-8\right)\)

\(=12.\left(-200\right)\)

\(=-2400\)

\(b,7.\left(-25\right).\left(-3\right)^2.\left(-4\right)\)

\(=7.\left(-3\right)^2.100\)

\(=7.9.100=63.100\)

\(=6300\)

\(d,\left[93-\left(20-7\right)\right]:16\)

\(=\left[93-13\right]:16\)

\(=80:16=5\)

\(e,51-\left(-51\right)+\left(-53\right)+49\)

\(=51.2-53+49=102-53+49\)

\(=49.2=98\)

\(f,168-49+\left(-68\right)+4\)

\(=168-68-49+4=100-45=55\)

Answer 2

\(g,53-\left(-7\right)+\left(-53\right)-49\)

\(=53+7-53-49\)

\(=7-49=-42\)

\(h,25.\left(-124\right)+124.25\)

\(=25.\left(-124+124\right)\)

\(=25.0=0\)

\(i,\left(-11\right).36-64.11\)

\(=11.\left(-36\right)+\left(-64\right).11\)

\(=11.\left(-36-64\right)=11.\left(-100\right)\)

\(=-1100\)

\(k,125.\left(-24\right)+24.125\)

\(=125.\left(-24+24\right)=125.0=0\)

\(l,125.\left(-23\right)+23.\left(225\right)\)

\(=-125.23+23.225\)

\(=23.\left(-125+225\right)=23.100=2300\)

\(m,-11.36+64.\left(-11\right)\)

\(=-11.\left(36+64\right)=-11.100=-1100\)