Shape Sequences ACET Reviewer: Lesson and Practice

TEACHER ABI ACET ABSTRACT REASONING

Shape Sequences

Solve interlocking sequences in which shape, number, position, shading, size, and rotation change on separate schedules.

Original SVG figures27 compound-figure questionsProgressive difficultyACET preparation

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Learn the method · Practise · Mastery check

START HERE

What kind of change is happening?

Do not begin by memorising rule names. Look at each short series first. Notice what changes, what repeats, and what stays independent.

Now name what you noticed

A cycle returns to its starting form. A side-count progression adds or removes sides. Repeated pairs hold each state for two frames. Interleaved chains place one sequence in the odd positions and another in the even positions.

DO IT FAST

Use TRACK → SPLIT → SCHEDULE → VERIFY

1. TRACK: Record outer shape, inner symbol, fill, marker, turn, and perimeter marks separately.
2. SPLIT: Test odd and even positions when consecutive transitions conflict.
3. SCHEDULE: Identify how often each feature changes: every frame, every second frame, or in a repeating cycle.
4. VERIFY: Reject a choice if even one scheduled feature is wrong.

ACET trap: Most distractors preserve the most obvious feature while violating a quieter one.

GUIDED TRY

Begin with a controlled two-rule sequence

1. The outer figure advances through the shape cycle.
2. The fill alternates white and gray.
3. The gold marker advances one corner per frame.
4. The inner symbol stays fixed; it is an invariant.

Check all features. The answer needs the next outer shape, alternating fill, next marker corner, and the unchanged inner symbol.

ACET-LEVEL WALKTHROUGH

Different features can run at different speeds

Every frame: the inner symbol changes.

Every two frames: the outer shape changes.

Every three frames: the fill advances.

Independent schedules: marker, rotation, and perimeter marks must also be continued.

Do not compress the rule into “the picture rotates.” Rotation is only one of six independently scheduled features.

FIVE-FORM SKILL CHECK

Find your starting level

CHOOSE YOUR PRACTICE

Build the skill in stages

Foundations

Recognize cycles and side counts.

Core

Follow cycles and two-part changes.

ACET Transfer

Separate interlocking visual rules.

FRESH MASTERY CHECK

Can you solve without the scaffolding?

Score 5/5 to verify this competency. If not, a fresh set loads.

QUICK ANSWERS

Shape Sequences FAQ

Should a circle count as a zero-sided polygon?

Not unless the item clearly establishes that rule. Treat a circle as its own shape in ordinary cycles.

When should I split odd and even positions?

Use two chains when consecutive frames seem inconsistent but positions 1-3-5 and 2-4-6 each form a simple pattern.

Can a sequence repeat shapes in pairs?

Yes. Look for groupings such as A, A, B, B, C, C before assuming each frame changes.

What if two rules fit the last frames?

Test both rules against the entire sequence. The intended rule should explain every transition economically.

Does orientation matter here?

Only when it is necessary to distinguish shapes. Use the separate Rotation, Reflection, and Orientation reviewer for focused practice.

NEED A STUDY PLAN?

Use your diagnostic result to decide what comes next

If Abstract Reasoning was one of your lowest sections, master the visual rules individually before attempting mixed timed figures.

Ask Teacher Abi for guidance

CONTINUE REVIEWING

Continue your ACET preparation

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