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The tenth place is the .6. Look over at the number next to it, the 7. It's greater than 5 so make the .6 one digit greater. Now your answer is 256.7

If Dan's science magazine has a mass of 256.674 grams. then mass of his magazine rounded to the nearest tenth is 256.7

What is rounding of numbers ?

Rounding means making a number more simpler by keeping its value close to original value .

We know that  if number we are rounding is followed by 5, 6, 7, 8, or 9 then we  round the number up. Example:  18 rounded to the nearest ten is 20. and if the number we are rounding is followed by 0, 1, 2, 3, or 4 then we round the number down. Example: 14 rounded to the nearest ten is 10.

Given number is 256.674 and tenth digit is 6 so we will round up

and number  rounded to the nearest tenth is 256.7

If Dan's science magazine has a mass of 256.674 grams. then mass of his magazine rounded to the nearest tenth is 256.7.

To learn more about rounding numbers visit :https://brainly.com/question/605451