Math // Number Representation & Place Value

Number Words to Twenty

Read and write number words from one to twenty

Ages
5 to 6
Type
Language
Builds on
3 topics
Leads to
1 topic
Standards
1 code

Quick check

Can the learner write number words like 'fourteen' or 'twenty' — and read them on a birthday card or in a story book without needing help?

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 the word 'twelve' and identify it as 12
  • Write the word form of a given number 1–20
  • Match numeral cards to number word cards

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

3 topics

You are here

Number Words to Twenty

Ages 5 to 6 // Language

Leads to

1 topic
  • Number Words to 100Required

    Number Representation & Place Value // Ages 6 to 7

    Writing number words to 100 extends from writing number words to 20

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

For ages 5–6, learners read and write the number words one–twenty and connect each word to its numeral and its quantity (a three-way word↔numeral↔quantity mapping with a spelling/production component). Many number words are irregular sight words (one, two, eight, twelve). Some teen words are opaque ('eleven' and 'twelve' give no clue to ten-and-one or ten-and-two), and others say the ones-part first ('thir-teen', 'fif-teen'), so teaching should keep the ten-and-ones meaning attached while building sight-word recognition and correct spelling. Practise both reading (word→quantity) and writing (numeral→word) directions. A wider 0–20 reference range (washing line, chart) can support this, while the production target is the words one–twenty.

Common misconceptions

  • Reading a number word as text without linking it to a quantity or numeral.
  • Spelling confusions: four/for, eight, nine→'nighn', and the many silent/irregular letters.
  • Teen/decade word muddles by sound: 'thirteen' vs 'thirty', 'fifteen' vs 'fifty'.
  • Assuming all number words are phonically regular and mis-decoding the irregular ones (one, two, eight).
  • Reversing the teen meaning because the word says the ones first (thir-teen → thinking 3 then 1 → 31).

Useful representations

  • Triple-match cards: numeral (13) ↔ word (thirteen) ↔ ten-frame/quantity.
  • Number-word washing line 0–20 above the numeral track for constant reference.
  • Colour/segment cues on teen words (thir·teen, four·teen) highlighting the ones-part + '-teen'.
  • Word-and-numeral labelling of classroom objects and calendar for incidental exposure.

Teaching practices

  • Explicitly link WORD ↔ NUMERAL ↔ QUANTITY (three-way matching) so the word is read for meaning, not just decoded as text; builds on secured numerals 0–20 (prerequisite mt_fR0UtsSREU).
  • Treat irregular number words as SIGHT words (one, two, four, eight, twelve) taught alongside phonically decodable ones (six, ten) — coordinate with the phonics/high-frequency-word programme.
  • Give the teens special attention: 'eleven'/'twelve' are opaque and must be memorised; 'thirteen–nineteen' say the ones-word first (thir, four, fif...) then '-teen' — pair with a ten-frame to keep the ten-and-ones meaning attached.
  • Use number-word washing lines, labels around the room, and books/rhymes so the words are met in reading and writing repeatedly, not just in a maths drill.
  • Practise both directions — read a word to make/point to the quantity, AND write the word for a given numeral — to prevent word-recognition without production (or vice versa).

Activities to try

  1. 1

    Word–numeral–quantity triple match

    Why it works: The number word carries meaning: it names a specific numeral AND a specific quantity, so the word must be read for meaning, not just decoded as text.

    1. Hear or read a number word such as 'thirteen'.
    2. Place or drag that word card onto its numeral (13).
    3. Place it onto a ten-frame or set showing one full ten plus three.
    4. Match across the number words one–twenty (with 0–20 available as reference), including a playful pairs/memory game over the words.
    5. Also work the reverse direction: given a numeral or a quantity, find and say the matching word.
  2. 2

    Build-the-word: spell the number for a numeral

    Why it works: Reading a number word and producing its correct written form are different skills; learners need to spell the word, not only recognise it.

    1. Look at a shown numeral (for example 13).
    2. Use letter tiles, tracing, or handwriting to build or write the matching word ('thirteen').
    3. Check the spelling against a reference wall, correcting classic traps like four/for and thirteen/thirty.
    4. Spell several words one–twenty, returning to the irregular and teen forms for extra practice.
  3. 3

    Teen zone: keep ten-and-ones visible

    Why it works: The teens name ten-and-ones even though the word is opaque ('eleven'/'twelve') or says the ones-part first; keeping the structure visible helps prevent the reversal 'thir-teen → 31'.

    1. Segment each teen word from thirteen to nineteen beside its quantity: thir·teen, four·teen, fif·teen, and so on.
    2. Place each segmented word next to a ten-frame showing one full ten plus the ones part.
    3. Memorise 'eleven' and 'twelve' as sight words paired with their ten-and-ones frames.
    4. Say the word slowly and match it to the quantity, noticing that the ones-word comes first (thir-) but the quantity is ten-and-three.

Topic // Standards

Curriculum standards

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

Math // Number Representation & Place Value

More in Number Representation & Place Value

All 52 topics