Math // Number Representation & Place Value

Reading and writing numbers to 20

Read and write numerals from 0 to 20

Ages
5 to 6
Type
Method
Builds on
2 topics
Leads to
6 topics
Standards
2 codes

Quick check

Can the learner read a number like '17' written on paper and write it themselves — and do they know what each digit means?

Ask this to see whether the topic is secure.

Topic // Mastery

What mastery looks like

What a learner can do once this topic is secure.
  • Read any numeral 0–20 when shown it
  • Write numerals 0–20 legibly from dictation
  • Represent a number of objects with the correct written numeral

Topic // Map

Where this fits

What to learn first and what this topic opens up, with the reason for each link. Required links come first.
  • RequiredMust come first
  • HelpfulHelps, but not essential

Before this

2 topics
  • How Many in Total?Required

    Counting & Cardinality // Ages 4 to 6

    Reading/writing numerals 0–20 requires understanding that numerals represent quantities (cardinality)

  • Writing digits 0-9Required

    English // Handwriting & Transcription // Ages 5 to 6

    Writing numerals requires the motor skill of forming digits 0-9 (taught in English handwriting)

You are here

Reading and writing numbers to 20

Ages 5 to 6 // Method

Leads to

6 topics
  • Reading +, −, and = symbolsRequired

    Addition & Subtraction // Ages 5 to 6

    Writing number sentences requires reading and writing numerals

  • Telling Time: Hours and Half HoursRequired

    Measurement // Ages 5 to 6

    Reading a clock requires recognising numerals 1–12

  • Coin ValuesRequired

    Measurement // Ages 5 to 6

    Recognising coin values requires reading numerals (1, 2, 5, 10, 20, 50)

  • Number Words to TwentyRequired

    Number Representation & Place Value // Ages 5 to 6

    Reading/writing number words requires already knowing the numeral forms

  • Reading and writing numbers to 100Required

    Number Representation & Place Value // Ages 5 to 6

    Reading/writing numerals to 100 extends from reading/writing numerals to 20

  • The teen numbersRequired

    Number Representation & Place Value // Ages 5 to 7

    Composing/decomposing teen numbers requires reading and writing those numerals

Topic // Research-informed

Teaching notes

From the Marble Skill Taxonomy. These notes have not been validated in classrooms, so treat them as a starting point for your own judgement.

The approach

Children aged 5–6 learn to read and write numerals 0–20, connecting the spoken number word, the quantity, and the written symbol. This is a foundational symbolic skill requiring numeral recognition on sight, legible numeral formation (a handwriting/motor skill), and two-way mapping between a numeral and a quantity. Teaching keeps numerals tied to amounts, treats digit formation as an explicit motor skill, and directly confronts the teen 'hear-it-write-it' transposition trap (writing 'thirteen' as 31) and classic digit reversals.

Common misconceptions

  • Digit reversals (2, 3, 5, 7, 9 written mirror-image) — a formation issue needing direct correction.
  • Teen transposition from speech: writing 'thirteen' as 31, 'fourteen' as 41 (hearing the ones first).
  • Reading a numeral without connecting it to a quantity (naming '7' but unable to make seven).
  • Confusing visually similar numerals (6/9, 2/5, 7/1) or omitting/misreading 0.
  • Treating a two-digit teen numeral as two separate single digits (reading 15 as 'one, five').

Useful representations

  • Ten-frame(s) beside the numeral (a full ten + extras for teens) linking symbol to a structured quantity.
  • Numeral formation cards with directional arrows / stroke-order guides for handwriting.
  • Number track / 0–20 washing-line pairing each numeral with its position and a matching set.
  • Numeral ↔ objects ↔ spoken-word matching cards (three-way correspondence).

Teaching practices

  • Keep the numeral tied to QUANTITY at all times — read/write the symbol beside a set of objects, a ten-frame, or fingers — so 0–20 are symbols FOR amounts, not decorations; grounds in cardinality (prerequisite mt_dmNvjroCPT).
  • Treat numeral formation as an explicit motor skill: model stroke order, use sky-writing/sand/whiteboards, and directly address reversals (2, 5, 7, 9) and the b/d-style confusions with multisensory tracing.
  • Confront the teen 'hear-it-write-it' trap head-on: 'thirteen' SOUNDS like three-then-ten but is written 13 (ten then three) — pair the spoken word with a ten-frame showing a full ten and 3 more, and with the written 13.
  • Use frequent read↔write↔represent switching (numeral card → make the set; set → write the numeral; hear it → write it) so all three modes are linked, not siloed.
  • Include 0 deliberately as 'none' and as a written symbol — many children can count but hesitate to read or write zero.

Activities to try

  1. 1

    Numeral studio: trace, build the quantity, self-correct

    Why it works: A numeral is a symbol FOR a quantity, written and read, not a decoration; the three modes (spoken word, quantity, written symbol) are one connected idea.

    1. Trace a numeral along a guided stroke-order path (start dot and directional arrows) on a whiteboard, in sand, by sky-writing, or on a coded surface that models stroke order.
    2. As the numeral is formed, build or watch a ten-frame fill to that many (using a second ten-frame for 11–20), so the symbol is felt as a quantity rather than a squiggle.
    3. Flip the task: tap/lay out a set of counters, then write or select the numeral that names how many.
    4. Switch frequently between the modes — numeral card → make the set; set → write the numeral; hear it → write it — so reading, writing and representing stay linked.
  2. 2

    Hear it, write it: addressing the teen transposition

    Why it works: The words for 13–19 say the ones first ('thir-teen') but the numerals are written ten-then-ones (13); eleven and twelve do not follow this pattern. Pairing the word with a full-ten-plus-extras quantity shows why 13, not 31, is correct.

    1. Listen to a spoken teen word, e.g. 'thirteen', and see two ten-frames: one FULL frame of ten and a second frame with 3 more.
    2. Write the numeral by forming the ten digit first and then the ones digit: 1 then 3.
    3. Check: if you write 31, the quantity would need three full tens and one more, which cannot match the single full ten and three extras shown.
    4. Repeat with 'fourteen', 'seventeen', 'nineteen', pairing the spoken word, the ten-structured quantity, and the written numeral each time.
    5. Include 0 deliberately — say 'none', show an empty frame, and read and write the symbol 0.
  3. 3

    Read-and-match reference wall and checks

    Why it works: Recognising and matching numerals to quantities is a distinct, checkable layer that should always reconnect the symbol to an amount and, where possible, to writing it.

    1. Use a 0–20 number track or washing-line pairing each numeral with its position and a matching set; tap or point to a numeral to hear its name and reveal a matching ten-frame display (two frames for 11–20).
    2. Match numeral cards to sets or ten-frames (three-way: numeral ↔ objects ↔ spoken word).
    3. Given a shown or spoken quantity, pick or write the matching numeral, including deliberate 12/21-style distractors to probe the teen trap.
    4. Trace a dictated numeral along a path to check formation.

Topic // Standards

Curriculum standards

Codes for the curriculum statements this topic maps to. Each publisher owns its standard text.
Common Core State Standards for Mathematics
K.CC.3
The national curriculum in England: Key stages 1 and 2 framework document
Maths/Y1/NPV/5

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