Foundation June 2023 Paper 1 Q23
23. The surface area of the Earth is \(5{\cdot}101 \times 10^8\) km\(^2\).
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. 0·7 × 50 000 000 |
| \(3{\cdot}5 \times 10^8\) (km\(^2\)) 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 \(3{\cdot}5 \times 10^8\) (km\(^2\)). |
| (3) |