Numbers to 120: Year 1 Maths topic guide

What students learn in AC9M1N01

This unit helps students build a clear, usable understanding of Numbers to 120. The goal is not to memorise one answer pattern. Students should be able to explain the idea, recognise it in a new example and apply it in a short practice or worksheet task.

• Start with the main idea: recognise, represent and order numbers to at least 120 using physical and virtual materials, numerals, number lines and charts.
• Use concrete examples, pictures, oral explanation and short written responses before moving to independent practice.
• reading, writing and naming numerals and ordering two-digit numbers from zero to at least 120, using patterns within the natural number system, including numbers that look and sound similar; for example, 16, 60, 61 and 66 using number tracks or positioning a set of numbered cards in the correct order and relative location by pegging on an empty number line
• Finish with mixed questions so students must choose the correct strategy rather than copy the last example.

Curriculum coverage and elaborations

The content description and elaborations below show the curriculum ideas taught in this unit. Items marked as teaching context support lesson planning but may not appear in the initial eight-question activity.

• Content description: recognise, represent and order numbers to at least 120 using physical and virtual materials, numerals, number lines and charts
• E1: reading, writing and naming numerals and ordering two-digit numbers from zero to at least 120, using patterns within the natural number system, including numbers that look and sound similar; for example, 16, 60, 61 and 66
• E2: using number tracks or positioning a set of numbered cards in the correct order and relative location by pegging on an empty number line
• E3: using hundreds charts to build understanding and fluency with numbers; for example, collaboratively building a hundreds chart using cards numbered from zero to 99; colour code the count of tens in a hundreds chart using one colour to represent the number of tens and another to represent the number of ones
• E4: recognising that numbers are used in all languages and cultures but may be represented differently in words and symbols; for example, through kanji numbers in Japanese and characters in Chinese, and that there are alternate numeration systems; for example, using special characters for 10 and 100 and other multiples of 10 in Japanese and Chinese numeration

How to use this unit

Read the topic guide, use the teacher slide for instruction, then complete the Worksheet, Practice and Test. These three activities use the same eight-question unit bank.

Common mistakes to watch for

• Rushing to a rule before checking the concrete model, drawing or number sentence.
• Using the correct answer once but not being able to explain why it works.
• Mixing up similar vocabulary such as more/less, before/after, longer/shorter or equal groups/sharing.

International curriculum mapping

This table gives closest-topic mapping for search and planning. The Australian Curriculum code is exact; overseas entries are broad equivalents because each jurisdiction structures outcomes differently.

Related Year 1 Maths topics

• AC9M1N02: Partitioning tens and ones
• AC9M1N03: Skip counting and equal groups
• AC9M1N04: Addition and subtraction within 20
• AC9M1N05: Additive problem solving and money
• AC9M1N06: Equal sharing and grouping
• AC9M1A01: Skip-counting pattern sequences
• AC9M1A02: Repeating patterns
• AC9M1M01: Comparing length, mass, capacity and duration

Official curriculum references

• Australian Curriculum Version 9.0
• Victorian Curriculum F-10
• NSW Curriculum
• Common Core State Standards
• Next Generation Science Standards
• England National Curriculum
• New Zealand Curriculum
• NCERT textbooks