Higher June 2023 Paper 1 Q8
8. The surface area of the Earth is \(5{\cdot}101 \times 10^{8}\) km2.
The Earth’s oceans are 70·9% of this surface area.
Estimate the surface area of the Earth’s oceans.
Give your answer in standard form. [3]
| Scheme | Marks | Comments |
|---|---|---|
| Sight of 70% and \(5 \times 10^{8}\) OR 71% and \(5 \times 10^{8}\) OR 70% and \(5{\cdot}1 \times 10^{8}\) | B1 | Not for sight of 71% and \(5{\cdot}1 \times 10^{8}\) |
| \(0{\cdot}7 \times 5 \times 10^{8}\) oe OR \(0{\cdot}71 \times 5 \times 10^{8}\) oe OR \(0{\cdot}7 \times 5{\cdot}1 \times 10^{8}\) oe | M1 | Allow for \(0{\cdot}71 \times 5{\cdot}1 \times 10^{8}\) If \(5 \times 10^{8}\) or \(5.1 \times 10^{8}\) is written in ordinary form, condone a slip by a power of 10 for M1. e.g. \(0{\cdot}7 \times 50\,000\,000\) |
| \(3{\cdot}5 \times 10^{8}\) (km2) ISW OR \(3{\cdot}55 \times 10^{8}\) ISW OR \(3{\cdot}57 \times 10^{8}\) ISW | A1 | CAO Award B1 M1 A1 for an unsupported answer of \(3{\cdot}5 \times 10^{8}\) (km2). |
| (3) |