Question

Ben is showing his work in simplifying (3.9 − 9.4) − 0.6 + 6.1. Identify any error in his work or reasoning.

Step 1: (3.9 − 9.4) − 0.6 + 6.1
Step 2: 3.9 + (− 9.4 − 0.6) + 6.1 (associative property)
Step 3: 3.9 − 10 + 6.1
Step 4: 3.9 + 6.1 − 10 (identity property)
Step 5: 10 − 10 = 0

Answer 1

the answer is 0.2 i think

Answer 2

Should have worked out brackets first then kept it to two subtractions (one being negative number total and the other being positive total number at step 3 ) taking you to step 4 as finish to just add the two numbers a( - 5.3) + (5.5) = 0.2

Explanation:

(3.9 − 9.4) − 0.6 + 6.1. To simplify do brackets first so the first error was Step 2 line we show (3.9 − 9.4)− 0.6 + 6.1 below = to (-5 .3) − 0.6 + 6.1 Then to simplify Step 3 line there was a second error as 3.9 was never a simplification of the brackets and here is how it should be ( - 5.3) − 0.6 + 6.1 = ( - 5.3) + (5.5) = ( - 5.3) + (5.5) Then to simplify Step 4 line we wont need a step 5 and are left to just add the two numbers ( - 5.3) + (5.5) = 0.2