How should the error-review paper be used?

Redo every item without looking, then check each one; the same mistake twice means it is not mastered yet.

Why do adjacent angles of a parallelogram add to 180°?

They are co-interior angles, which together make a straight angle.

What is the difference between a rhombus and a square?

A rhombus has four equal sides but not necessarily right angles; a square has both.

P4 Maths Classifying Quadrilaterals Paper 4: Error Review

2026-11-09

Tutor Prep Guide · P4 Maths

Ten original items, each with an answer and a one-line explanation.

Direct answers　Items 1-3 are basic, 4-6 intermediate and 7-9 challenge, with item 10 as the error review. Time yourself first, then check each answer and redo what is wrong.

01　Paper details (check answers afterwards)

Item	Detail
Questions	10
Suggested time	20
Difficulty mix	Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1
Chapter	Chapter: P4 Maths Classifying Quadrilaterals
Level	P4

02　Questions (10 items)

FoundationError review: what is the angle sum of a quadrilateral?
FoundationThree angles of a quadrilateral are 90° each. Find the fourth angle and name the shape.
FoundationHow many pairs of parallel sides has a trapezium?
IntermediateOne angle of a parallelogram is 70°. Find the angle next to it.
IntermediateEach side of a rhombus is 7 cm. Find its perimeter.
IntermediateOne base angle of an isosceles trapezium is 65°. Find the other angle on the same base.
ChallengeA rectangle has perimeter 42 cm and length 13 cm. Find its width.
ChallengeThe angles of a parallelogram are in the ratio 1 : 2 : 1 : 2. Find the smallest and largest angles.
ChallengeA trapezium has parallel sides 6 cm and 10 cm and two 5 cm legs. Find its perimeter.
Error redoError review: a pupil says every parallelogram has four equal sides. Is that correct?

03　Answers and one-line notes

#	Answer	One-line note
1	360 degrees	A quadrilateral splits into two triangles, so 180 times 2 = 360 degrees.
2	90 degrees; a square or a rectangle	360 minus 90 minus 90 minus 90 = 90 degrees, which gives a rectangle, or a square if all sides are equal.
3	One pair	A trapezium has exactly one pair of parallel sides; two pairs would make it a parallelogram.
4	110 degrees	Adjacent angles of a parallelogram add to 180 degrees, so 180 minus 70 = 110 degrees.
5	28 cm	All four sides are equal, so 7 times 4 = 28 cm; no squaring is involved.
6	65 degrees	The two base angles on the same base are equal, so it is also 65 degrees; 115 degrees is the angle on the other base.
7	8 cm	Length plus width is 42 divided by 2 = 21 cm, so the width is 21 minus 13 = 8 cm.
8	60 degrees and 120 degrees	There are six parts in 360 degrees, so each part is 60 degrees, giving 60 and 120 degrees.
9	26 cm	Add all four sides: 6 + 10 + 5 + 5 = 26 cm.
10	No	A parallelogram only guarantees opposite sides are equal; four equal sides make a rhombus, and a square is a special rhombus.

04　What to do after marking

After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
Repeat the same item two days later; move to the next paper only when both attempts are correct.
Parents only need the answer and note columns; there is no need to explain every item.

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Questions and answers are written originally by the TutorZone team and are not taken from any school, publisher or examination authority paper. Every value is checked by computer.