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 - OCR - GCSE Maths - Question 3 - 2018 - Paper 1

For the calculations:

• 326.8 rounds to 300
• 6.94 rounds to 7
• 3.4 rounds to 3
• 59.4 rounds to 60

Now substituting these rounded values into the expression:

$\frac{300 \times (7 - 3)}{60}$

which simplifies to:

$\frac{300 \times 4}{60} = \frac{1200}{60} = 20$