Number — Grade 1

• Add and subtract within 10

  Litnumia skill: Add and subtract within 10

  Student-invented and mental strategies first (decomposing, compensating, open number lines); standard algorithms are consolidated later than in other systems.

• Add and subtract within 20

  Litnumia skill: Add and subtract within 20

  Student-invented and mental strategies first (decomposing, compensating, open number lines); standard algorithms are consolidated later than in other systems.

• Compare and order numbers to 20

  Litnumia skill: Compare and order numbers to 20

  Represent numbers with a variety of tools (ten-frames, base-ten blocks, number lines) and contexts; students explain their reasoning and compose/decompose numbers flexibly.

• Count objects to 20

  Litnumia skill: Count objects to 20

  Represent numbers with a variety of tools (ten-frames, base-ten blocks, number lines) and contexts; students explain their reasoning and compose/decompose numbers flexibly.

• Equal groups and sharing

  Litnumia skill: Equal groups and sharing

  Equal groups and arrays with tools; students choose among flexible strategies (halving/doubling, partial products) before standard algorithms in later grades.

• Halves and fourths of shapes

  Litnumia skill: Halves and quarters of shapes

  Heavy use of visual models (fraction strips, number lines, area models); Ontario says 'fourths'; equivalence and operations reasoned through models before symbols.

• Number bonds to 10

  Litnumia skill: Number bonds to 10

  Student-invented and mental strategies first (decomposing, compensating, open number lines); standard algorithms are consolidated later than in other systems.

• Ordinal numbers

  Litnumia skill: Ordinal numbers

  Represent numbers with a variety of tools (ten-frames, base-ten blocks, number lines) and contexts; students explain their reasoning and compose/decompose numbers flexibly.

• Read and represent whole numbers to 50

  Litnumia skill: Read and write two-digit numbers

  Represent numbers with a variety of tools (ten-frames, base-ten blocks, number lines) and contexts; students explain their reasoning and compose/decompose numbers flexibly.

• Skip count in 2s, 5s and 10s

  Litnumia skill: Skip count in 2s, 5s and 10s

  Represent numbers with a variety of tools (ten-frames, base-ten blocks, number lines) and contexts; students explain their reasoning and compose/decompose numbers flexibly.