Answer Guide — Mapping the Hollow (A2): Worked Solutions
Teacher answer guide for the summative assessment "Mapping the Hollow: Measurement, Shape & Data" (A2). Full worked solutions and explanations for all 10 questions across fractions/decimals, measurement/time, shape/angles and data/chance, each illustrated with an animated SVG that shows the concept and the solution together. Maps answers to the marking criteria. For teacher use.
Teacher answer guide for Mapping the Hollow (A2). Each question shows the expected answer, the working, the reasoning to look for, and an animation that builds the solution. On-screen the diagrams animate; in print they show the finished state.
Part A — Fair shares (fractions & decimals)
1. Colour three-quarters; write the fraction.
Answer:3/4 (three of the four equal parts shaded).
2. A fraction equal to 1/2; and 3/10 as a decimal.
Answer: any equivalent such as 2/4, 3/6 or 5/10; and 3/10 = 0.3.
3. Mark 1 1/2 on a number line from 0 to 3.
Answer: the point sits exactly halfway between 1 and 2.
Part B — Measuring the bush (measurement & time)
4. 1 m 35 cm in centimetres.
Answer:135 cm (100 + 35).
5. Duration from 9:15 am to 10:05 am.
Answer:50 minutes (45 min to 10:00, then 5 more).
6. Estimate the leaf's area in square units.
Answer: about 9 square units (accept 8–10). Count squares that are at least half covered as one.
Part C — Looking closely (shape & angles)
7. A square split along its diagonal.
Answer:two triangles (two right-angled triangles, equal in size).
8. Tick the angle smaller than a right angle; sketch one bigger.
Answer: the acute (middle) angle is smaller than a right angle; a correct "bigger" sketch is any obtuse angle (opening wider than a square corner).
