PLZ HELP ME IM ON A QUIZ!!! Which calculation shows the best method for estimating the result of 674 times seven-twelfths?

600 times one-third equals 200
600 times one-half equals 300
690 times one-third equals 230
700 times one-half equals 350

Which calculation shows the best method for estimating the result of 384 divided by three-sixteenths?

400 divided by one-fourth equals 1,600
400 divided by one-fourth equals 100
300 divided by one-third equals 900
300 divided by one-third equals 100

Which expression is most easily solved without the use of a calculator?

(5.6 – 2.9) × 2.2
1.2 × (8.4 – 6.4)
(8.7 – 1) × 5.4
0.9 × (7.8 – 3.9)

What value of x will result in an expression that is the easiest to solve without the use of a calculator?

–1.1(x + 0.56)

x = –1
x = –0.06
x = 0
x = 0.56