Asha worked out
$$\frac{326.8 \times (6.94 - 3.4)}{59.4}$$ - OCR - GCSE Maths - Question 3 - 2018 - Paper 1
Question 3
Asha worked out
$$\frac{326.8 \times (6.94 - 3.4)}{59.4}$$.
She got an answer of 19.5, correct to 3 significant figures.
Write each number correct to 1 significan... show full transcript
Worked Solution & Example Answer:Asha worked out
$$\frac{326.8 \times (6.94 - 3.4)}{59.4}$$ - OCR - GCSE Maths - Question 3 - 2018 - Paper 1
Step 1
Write each number correct to 1 significant figure
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Answer
For 326.8: The first significant figure is 3, so it becomes 300.
For 6.94: The first significant figure is 7, so it becomes 7.
For 3.4: The first significant figure is 3, so it becomes 3.
For 59.4: The first significant figure is 6, so it becomes 60.
Step 2
Is Asha's answer reasonable?
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Answer
Calculating with these rounded figures:
60300×(7−3)=60300×4=20.
This estimated answer of 20 is close to Asha's answer of 19.5. Thus, Asha’s answer is reasonable.
