One.
5 significant figures.
Rounded to two significant figures, 7.42 grams is approximately equal to 7.4 grams.
4 of them.
When reporting a measurement of 15 grams, it has two significant figures, as both digits (1 and 5) are non-zero and contribute to its precision. Since the number is presented without any decimal point, it implies that the measurement is exact to the nearest whole gram. Therefore, you should report the weight of the object as having two significant figures.
5
5 significant figures.
Rounded to two significant figures, 7.42 grams is approximately equal to 7.4 grams.
The 3 and the 2.
There are 3 significant figures in '4.50g'
to .0251 grams or 2.51 x 10-2 grams
302.05 grams
302.5 grams
4 of them.
Three of them.
When reporting a measurement of 15 grams, it has two significant figures, as both digits (1 and 5) are non-zero and contribute to its precision. Since the number is presented without any decimal point, it implies that the measurement is exact to the nearest whole gram. Therefore, you should report the weight of the object as having two significant figures.
4
5