Foundation November 2018 Paper 2 Q2

OCRFoundationCurrent spec8 marksFractions

2 Work out.

(a) \(\dfrac{1}{2}\) of 12 [2]

(b) \(8 \times \dfrac{1}{5}\)

Give your answer as a mixed number. [2]

Isaac eats \(\dfrac{1}{6}\) of the pizza.

Maya then eats \(\dfrac{3}{5}\) of the remaining pizza.

What fraction of the original pizza is left? [4]

Answer	Marks	Part marks and guidance
6	2	M1 for 12 \(\div\) 2 oe

Answer	Marks	Part marks and guidance
\(1\dfrac{3}{5}\)	2	M1 for \(\dfrac{8}{5}\) or \(\dfrac{8 \times 1}{5}\)

Mark scheme (c)

Answer	Marks	Part marks and guidance
\(\dfrac{2}{6}\) oe nfww	4	M3 for \(1 - \dfrac{1}{6} -\) their \(\left(\dfrac{3}{6}\right)\) oe or M2 for their \(\left(\dfrac{5}{6}\right) \times \dfrac{3}{5}\) soi or \(\dfrac{3}{6}\) seen or M1 for \(1 - \dfrac{1}{6}\) or \(\dfrac{5}{6}\) seen If 0 scored SC2 \(1 - \dfrac{23}{30} = \dfrac{7}{30}\) or SC1 for \(\dfrac{1}{6} + \dfrac{3}{5} = \dfrac{23}{30}\)	Mark to candidates advantage Alternative method using diagram SC1 drawing pizza and shading \(\dfrac{1}{6}\) Or SC2 for drawing 3 more of the five Slices (i.e. 4 out of 6 parts shaded)