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Aleksandr [31]
2 years ago
11

Which expression shows you how you can use mental math to simplify the expression (53 + 23) + 7 most easily? A. 7 + (23 + 53) B.

(23 + 53) + 7 C. 53 + (23 + 7) D. 7 + (53 + 23)
Mathematics
2 answers:
lidiya [134]2 years ago
8 0

Answer:

The answer is C. 53 + (23+7).

Step-by-step explanation:


Ymorist [56]2 years ago
4 0

Answer:

C. 53 + (23 + 7)

Step-by-step explanation:


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Matt is showing his work in simplifying (6.2 − 1.6) − 4.4 + 7.8. Identify any error in his work or reasoning. Step 1: (6.2 − 1.6
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Answer:

The correct option is (d)-He wrote commutative instead of associative in Step 2.

Step-by-step explanation:

Commutative property: a+b=b+a

Associative property: (a+b)+c=a+(b+c)

Now consider the provided expression.

(6.2 − 1.6) − 4.4 + 7.8

Step 1

(6.2 − 1.6) − 4.4 + 7.8

Step 2 Use Associative property

6.2 + (−1.6 − 4.4) + 7.8

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Step 4: Use commutative property

14 − 6

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Hence, the wrong step is step 2. He wrote commutative instead of associative in Step 2.

Therefore, the correct option is (d)-He wrote commutative instead of associative in Step 2.

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3 years ago
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