Question

Which shows the use of the associative and commutative properties to make simplifying simplifying 3.2 + 20 – 3+ 4.8 + 19 easier? A. (3.2 + 4.8) + [20 + 19 +(-3)] B. (3.2 + 20)+(-3+ 4.8 +19) C. [3.2+(-3) +20 + (19 + 4.8) D. (19+ 3.2 +20) + [4.8+(-3)]

Answer 1

The given expression is

$3.2+20-3+4.8+19$

The best choice is A because it's associating positive numbers between them to make easier the sum, and the negative numbers are placed at last to make it easier to subtract. Additionally, it's associating decimal numbers which are mandatory.

Hence, the answer is A.