Foundation November 2021 Paper 2 Q13
13
(a) Reece is given this question.
Write 20 as a product of prime factors.
Give your answer in index form.
Reece’s answer is \(2 \times 2 \times 5\).
Is Reece correct?
Explain your answer. [1]
(b) Complete the power of 2.\[\frac{1}{8} = 2^{\square}\]
[1]
(c) Work out. \(\sqrt{81} \times 2^3\) [3]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| [No,] answer is not in index form oe | 1 | Accept it should be \(2^2 \times 5\) but do not isw if with an incorrect statement | |
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| \(-3\) | 1 | ||
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| 72 | 3 | B1 for [\(\sqrt{81} =\)] 9 B1 for [\(2^3\) oe =] 8 | For 3 marks condone \(\pm 72\) or \(-72\) For B1 condone \(\pm 9\) or \(-9\) |