| Exam Board | OCR |
|---|---|
| Module | C1 (Core Mathematics 1) |
| Year | 2009 |
| Session | January |
| Marks | 3 |
| Paper | Download PDF ↗ |
| Mark scheme | Download PDF ↗ |
| Topic | Indices and Surds |
| Type | Simplify numerical surds |
| Difficulty | Easy -1.2 This is a routine surd simplification requiring only basic techniques: simplifying √45 = 3√5 and rationalizing 20/√5 = 4√5, then combining like terms. It's a standard textbook exercise with straightforward steps and no problem-solving insight required, making it easier than average. |
| Spec | 1.02b Surds: manipulation and rationalising denominators |
1 Express $\sqrt { 45 } + \frac { 20 } { \sqrt { 5 } }$ in the form $k \sqrt { 5 }$, where $k$ is an integer.
\hfill \mbox{\textit{OCR C1 2009 Q1 [3]}}