Mentora

Sec 1 G3 Mathematics

Find your Sec 1 topics and choose what to revise next.

See the Sec 1 topic map

Browse topics

Choose what to revise

See the checklist

What you’re studying

Number and Algebra

Numbers, ratio, percentage, expressions and linear graphs.

Geometry and Measurement

Angles, shapes, area and volume.

Statistics and Probability

Tables and data diagrams.

What these skills connect towards

Mentora learning connections · curriculum guidance, not personal mastery.

N1 → N2

Number operations and fraction equivalence support ratio calculations.

N2 → N3

A ratio comparison can be expressed as a percentage once the reference quantity is clear.

What to revise

  • Numbers: fractions, decimals, negative values and estimation.
  • Ratio, percentage, rate and unit conversions.
  • Expressions, linear equations, coordinates and straight-line graphs.
  • Angle facts, measurement units and reading data displays.

Where to start

Mentora suggested foundation checks

  • Four operations with whole numbers, fractions and decimals.
  • Equivalent fractions and ratios; percentage and common units.
  • An unknown letter, order of operations and coordinate pairs.
  • Angle facts; length, area and volume units.
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Curriculum source and scope

Topic codes and level groupings follow the MOE G2 and G3 Mathematics Syllabuses. MOE publishes this scope by secondary level; it is not a school-by-school term calendar. Class teaching order can vary. Reviewed 2026-09-26.