Math // Number Representation & Place Value

Reading and writing numbers to 120

Count to 120 starting at any number less than 120; read and write numerals to 120

Ages
6 to 7
Type
Method
Builds on
2 topics
Leads to
0 topics
Standards
1 code

Quick check

Can the learner start counting from any number up to 120 — for example, starting at 87 and counting up to 120 without losing track?

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.
  • Count from 47 to 120 without errors
  • Read the numeral 108 correctly
  • Write the numeral for one hundred and fifteen

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
  • Rote counting to 100Required

    Counting & Cardinality // Ages 5 to 6

    Counting to 120 extends fluent rote counting to 100

  • Reading and writing numbers to 100Required

    Number Representation & Place Value // Ages 5 to 6

    Counting and reading/writing to 120 extends from reading/writing numerals to 100

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Reading and writing numbers to 120

Ages 6 to 7 // Method

Leads to

0 topics

Nothing in the catalogue builds on this topic yet. Browse Number Representation & Place Value

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 6–7: count to 120 starting from ANY number below 120, and read/write numerals to 120. Two skills carry the load: (i) counting on from an arbitrary start (not always from 1), so children feel the count as a movable sequence they can enter anywhere; and (ii) crossing 100 — reading and writing 100–120, where the hundreds place appears and children must learn that 'one hundred and eight' is 108, not 1008. Give special attention to the 99→100 and 109→110 crossings and to the write-what-you-hear trap. The primary approach is an interactive 120-grid twinned with a number line; a static grid and short written/spoken checks are useful supporting tools with their own limits.

Common misconceptions

  • Writing three-digit words literally: 'one hundred and eight' → 1008, or 'one hundred and fifteen' → 10015/1015 (missing the zero-tens placeholder or concatenating).
  • Stalling or resetting at 100 (saying 'one hundred, two hundred' or restarting at 1) when counting on.
  • Only being able to count from 1, not from an arbitrary start number.
  • Boundary slips: 99→'nine hundred' or 109→200-type errors.
  • Reading 108 as 'ten eight' or 'one-oh-eight' without the hundred meaning.

Useful representations

  • 120-grid (extended 100-square) showing the pattern continuing past 100.
  • Bead string / number line to 120 for counting on from any point and crossing 100.
  • Place-value / arrow cards composing 108 as 100 + 8 (zero-tens placeholder visible).
  • Number track segments across the 99→100 and 109→110 crossings.

Teaching practices

  • Practise counting on FROM ANY number (start at 47, at 96, at 112) so children internalise that the count sequence can be entered anywhere — not a fixed chant from 1.
  • Give special attention to the 99→100 and 109→110 crossings and the 100–120 numerals, where the new hundreds place trips reading/writing.
  • Confront the write-what-you-hear trap for three-digit words: 'one hundred and eight' → 108, NOT 1008; use place-value/arrow cards (100 + 8) to show the zero tens placeholder.
  • Extend the 100-square to a 120-grid so the pattern continues visibly past 100 and children see 101–120 as 'one hundred and ...'.
  • Balance count / read / write and forwards/backwards across the boundary to build robust fluency.

Activities to try

  1. 1

    Count on from any number across 100 (interactive grid and line)

    Why it works: The count is a movable window you can enter at any number, not a fixed chant that must start at 1; it continues smoothly past 100, where 101–120 are 'one hundred and ...'.

    1. Pick any starting number — for example 47, 96, or 112 — and count on out loud, one number at a time, as each number is highlighted in turn on a 120-grid and a matching number line.
    2. Deliberately practise starts that sit just before a boundary (start at 96 and count 97, 98, 99, 100, 101; start at 108 and count 109, 110, 111) so the century and decade rollovers get extra rehearsal.
    3. Count backwards too (for example from 112 down past 100) to show the sequence runs both ways across the boundary.
    4. While counting, keep the single running count going — avoid resetting to 1 or jumping to 'two hundred' after 100.
  2. 2

    Build the numeral from the spoken words with place-value cards

    Why it works: Three-digit numerals are built by place value, not by stringing the spoken words together; the zero in 108 is a tens placeholder, and concatenating words gives numbers far too large.

    1. Hear or read a number word such as 'one hundred and eight' and build it with place-value / arrow cards: pull the '100' card, note there are zero tens, then the '8' card, so the cards overlay to read 108.
    2. Say what job the 0 is doing in 108 — it holds the empty tens place.
    3. Do the same for 'one hundred and fifteen' → compose 100, then 1 ten, then 5, reading 115.
    4. Confront the trap directly: write the words out literally (1008, 10015) and compare that number to where it would sit relative to the 120-grid — far off the board — to see why it can't be right.
  3. 3

    Fluency and trap checks: sequence, read, and write across 100

    Why it works: These checks show whether a learner can complete sequences across 100, read numerals 100–120 with their hundred meaning, and write them by place value rather than concatenating words; sustained counting across 100 is confirmed through the spoken counting activity.

    1. Fill the missing numbers in a run that crosses the boundary, e.g. 97, 98, __, __, 101.
    2. Read a given numeral aloud, e.g. 108, as 'one hundred and eight'.
    3. Write the numeral for a spoken/written number word, e.g. 'one hundred and fifteen' → 115.
    4. Use a slider or marker to land on target numbers up to 120.

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
1.NBT.1

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