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ehensl06
18.09.2021 •
Mathematics
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Ответ:
Step-by-step explanation:
Ответ:
(b) The correct strategy is : Round 39.75 to 40 and 47.6 to 48, then add.
Step-by-step explanation:
Here,
The length of the fist ribbon = 47.6 inches
The length of the second ribbon = 39.75 inch
Now, as the number 47.6 has digit 6 in its tenth place of decimal.
Also, 6 > 5, so 0. 6 is rounded off to 1.0
Hence, 47.6 is rounded off to 47 + 1.0 = 48
So, the rounded off length of the first ribbon = 48 inches
the number 39.75 has digits 75 in its tenth and hundredth place of decimal.
Also, 75 > 50, so 0. 75 is rounded off to 1.0
Hence, 39.75 is rounded off to 39 + 1.0 = 40
So, the rounded off length of the second ribbon = 40 inches
So, the sum of the two length = Sum of ( First + Second ) length
= 48 inches + 40 inches = 88 inches
Hence, the correct strategy is :
Round 39.75 to 40 and 47.6 to 48, then add.