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7 (a) Round 81.469 to 1 decimal place - OCR - GCSE Maths - Question 7 - 2018 - Paper 1
Question 7
7 (a) Round 81.469 to 1 decimal place. (b) Round 0.005 694 to 3 significant figures.
Worked Solution & Example Answer:7 (a) Round 81.469 to 1 decimal place - OCR - GCSE Maths - Question 7 - 2018 - Paper 1
Step 1
Round 81.469 to 1 decimal place.
Answer
To round the number 81.469 to one decimal place, we focus on the digit in the first decimal place, which is '4'. The next digit, '6', will determine whether we round '4' up or leave it as is. Since '6' is greater than or equal to '5', we round '4' up to '5'. Therefore, the number rounded to one decimal place is:
81.5
Step 2
Round 0.005 694 to 3 significant figures.
Answer
For rounding 0.005694 to three significant figures, we first identify the significant figures. The first three significant figures in 0.005694 are '5', '6', and '9'. The next digit is '4', which is less than '5', so we do not round up. Thus, the number rounded to three significant figures is:
0.00569