Part A. A bakery measured the mass of a whole cake as 0.870 kg. A customer bought one slice of the cake and measured the mass of the slice as 0.1151 kg. What is the mass of the remaining cake, without the one slice?
Express your answer in kilograms using the appropriate number of significant figures.
It will be helpful to remember two guidelines about significant figures.
1. After multiplication or division, the answer cannot have more significant figures than any of the original numbers.
2. After addition or subtraction, the answer cannot have more digits to the right of the decimal point than any of the original numbers.
After determining the appropriate number of significant figures, round off your final answer.
1. If the first digit you drop is greater than or equal to 5, add 1 to the last digit you keep. You are rounding up.
2. If the first digit you drop is less than 5, do nothing to the digits you keep. You are rounding down.
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Significant Figures concept. You can view video lessons to learn Significant Figures. Or if you need more Significant Figures practice, you can also practice Significant Figures practice problems.