Numeracy Foundation November 2017 Unit 1 Q6
6.
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.
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]
| 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 |