Question

Ada is showing her work in simplifying (5.9 – 1.8) – 6.2 + 4.1. In which step did Ada make an error?

Step 1: (5.9 – 1.8) – 6.2 + 4.1

Step 2: 5.9 + (–1.8 – 6.2) + 4.1 (associative property)

Step 3: 5.9 – 8 + 4.1

Step 4: 5.9 + 4.1 – 8 (associative property)

Step 5: 10 – 8 = 2

Step 2; she wrote associative instead of commutative
Step 2; she wrote associative instead of distributive
Step 4; she wrote associative instead of commutative
Step 4; she wrote associative instead of distributive