2D Area & Perimeter: WJEC GCSE Numeracy Foundation November 2017 Unit 1 Q6

Numeracy Foundation November 2017 Unit 1 Q6

WJECFoundationCurrent spec3 marks2D Area & Perimeter

Pictures of a square cake and a rectangular cake, each with ribbon around the edge tied in a bow

Delyth makes birthday cakes.
To make a rectangular cake, Delyth cuts a 20 cm square cake in half, and joins the two pieces together, as shown in the diagram below.

Square cake 20 cm by 20 cm with a dashed line down the middle; rectangular cake made from the two halves joined end to end, with a dashed line at the join

Delyth puts ribbon around the edge of her cakes as shown in the pictures above.
How much more ribbon does Delyth need for the rectangular cake than for the square cake?
You must show all your working. [3]

Mark scheme

Scheme	Marks	Comments
20 × 4 OR 20 + 20 + 10 + 20 + 20 + 10 80 (cm) AND 100 (cm) 20 (cm)	M1 A1 B1	FT ‘their derived 100’ – ‘their derived 80’ Alternative markscheme: Award SC3 if rectangular diagram labelled with all dimensions and answer given as 20 cm Award SC2 if rectangular diagram labelled with dimensions on one width and one length and answer given as 20 cm Award SC2 if either 80(cm) or 100 (cm) seen with an answer of 20 (cm) Award SC1 if diagram labelled with dimensions on at least one width and one length (with 20cm not given) Award SC1 if only 20cm seen with no workings or dimensions labelled Award SC1 if 20cm seen with only one dimension labelled Note: the dimensions may be implied from their workings or statements