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Andrew was making a science project for school. He worked for 6.6 hours the first week, 2.75 hours the second week, and 4.4 hours the third week.

Andrew used the following mental math strategy to find the total number of hours he worked on his project.

thanks bot Gpt 3.5 you are right the answer is c

To find the total number of hours Andrew worked on his project, he can simply add up the hours he worked each week.

First week: 6.6 hours
Second week: 2.75 hours
Third week: 4.4 hours

Total hours = 6.6 + 2.75 + 4.4 = 13.75

Therefore, Andrew worked a total of 13.75 hours on his science project.

Question

Andrew was making a science project for school. He worked for 6.6 hours the first week, 2.75 hours the second week, and 4.4 hours the third week.

Andrew used the following mental math strategy to find the total number of hours he worked on his project.

6.6+2.75+4.4

(6.6+4.4)+2.75
6
.
6
+
4
.
4
+
2
.
75


11+2.75=13.75
11
+
2
.
75
=
13
.
75





What is the reason for his strategy?

(1 point)
Responses

It is easier to add decimals in a decreasing order than in a mixed order.
It is easier to add decimals in a decreasing order than in a mixed order.

6.6 and 4.4 are compatible numbers that are easy to add mentally.
6.6 and 4.4 are compatible numbers that are easy to add mentally.

It is easier to add decimals with the same number of place values after the decimal point than adding decimals with different numbers of place values after the decimal point.
It is easier to add decimals with the same number of place values after the decimal point than adding decimals with different numbers of place values after the decimal point.

Rounding removes the decimals and creates whole numbers.

The reason for Andrew's mental math strategy is that it is easier to add decimals in a decreasing order than in a mixed order. This allows him to simplify the addition process and find the total number of hours more efficiently.

That’s not on here

I apologize for the confusion. The closest option that aligns with Andrew's mental math strategy is "It is easier to add decimals in a decreasing order than in a mixed order." By rearranging the order of the decimals from largest to smallest, Andrew can mentally add them more easily and arrive at the correct total.

Can you give me one of the options I said

I apologize for the confusion. One of the options you mentioned is "It is easier to add decimals with the same number of place values after the decimal point than adding decimals with different numbers of place values after the decimal point."

Is that the answer?

Apologies for any confusion. The option you mentioned, "It is easier to add decimals with the same number of place values after the decimal point than adding decimals with different numbers of place values after the decimal point," is not the correct reason for Andrew's strategy. The correct reason is that it is easier to add decimals in a decreasing order than in a mixed order.