Work out each one and write the answer properly: 3.6 × 2.15; 15.32 + 0.7 + 8.115; 9.00/1.5
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Work out each one and write the answer properly:
Need a reminder? The key ideaShow
Significant figures are the sure digits plus the first unsure one. Leading zeros never count; zeros between digits count; trailing zeros after a decimal point count. A product or quotient keeps the fewest significant figures of its factors; a sum or difference keeps the fewest decimal places of its terms.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Product. . has two figures, so .
Step 2. Sum. . has one decimal place, so .
Step 3. Quotient. . has two figures, so write .
Answer: (a) . (b) . (c) .
Watch out. In (c) the calculator shows , but has only one significant figure. The answer must show two: .
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