9 (a) Round 7.3065 to 2 decimal places.
(b) Round each number to 3 significant figures.
(i) 408 231
(ii) 0.006137 02
Worked Solution & Example Answer:9 (a) Round 7.3065 to 2 decimal places - OCR - GCSE Maths - Question 11 - 2017 - Paper 1
Step 1
Round 7.3065 to 2 decimal places.
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Answer
To round 7.3065 to two decimal places, we look at the third decimal place, which is 6. Since 6 is greater than or equal to 5, we round the second decimal place up. Thus, 7.3065 rounded to two decimal places is 7.31.
Step 2
Round 408 231 to 3 significant figures.
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Answer
The first three significant figures of 408 231 are 408. Looking at the fourth significant figure (2), which is less than 5, we do not round up. Therefore, 408 231 rounded to three significant figures is 408 000.
Step 3
Round 0.006137 02 to 3 significant figures.
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Answer
In the number 0.006137 02, the first three significant figures are 6, 1, and 3. We look at the fourth significant figure (7), which is greater than 5, so we round up. Thus, 0.006137 02 rounded to three significant figures is 0.00614.
