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

Answers

  1. Answer:
    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
    Step-by-step 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

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