Mathematics / Year 3 / Number and Algebra / Number and place value

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Curriculum content descriptions

Recall addition facts for single-digit numbers and related subtraction facts to develop increasingly efficient mental strategies for computation (ACMNA055)

Elaborations
  • recognising that certain single-digit number combinations always result in the same answer for addition and subtraction, and using this knowledge for addition and subtraction of larger numbers
  • combining knowledge of addition and subtraction facts and partitioning to aid computation (for example 57 + 19 = 57 + 20 – 1)
General capabilities
  • Numeracy Numeracy
ScOT terms

Mental arithmetic,  Subtraction,  Addition,  Associativity

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16 direct matches to ACMNA055 | 4 other related resources
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Interactive

The difference bar: generate easy subtractions

  • TLF-IDL111

Learn how to split up numbers in your head. Use a linear partitioning tool to help find the difference between pairs of two-digit numbers such as 25 and 34. In these examples, the difference is always less than ten. Split the numbers into parts that are easy to work with, work out each part and then solve the original calculation.

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Online

reSolve: Algebra: Number Sequences

  • TLF-IDM021830

This sequence of lessons aims to build students' algebraic thinking through explorations of additive number patterns. Students are challenged to solve problems to generate patterns, explore strategies for addition and subtraction and apply their skills to constructing their own new patterns.The lessons are outlined in detail ...

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Online

reSolve: Addition: Chess - The Rook

  • TLF-IDM021829

This lesson engages students in investigating place value and the addition and subtraction of numbers by exploring computation on the number chart. Students analyse the moves of a rook chess piece and how the value of the numbers change as he moves. This builds into an exploration of how the number chart can be used as ...

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Interactive

Sushi monster - iTunes app

  • TLF-IDM019681

The Sushi monster needs to be fed the correct sum or product. Choose to play the addition or multipliaction game. In the addition game select the two numbers that make the target sum. In the multipication game select two numbers to make the target product. This game has several levels. Free when reviewed on 12/5/2015.

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Text

Salute - Calculate

  • TLF-IDA004370

This game gives students opportunities to practise addition and subtraction strategies and develop algebraic thinking by finding unknown values in additive equations.

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Text

Pattern & Algebra Year 3 - Calculate

  • TLF-IDA004351

The focus of this activity is to discover if students can use numbers to describe a pattern created with objects. We want to encourage students to record what they know about the pattern in a table and then use this information to help predict future terms and identify the rule or function for the pattern. At this stage, ...

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Text

Park Ranger Problem Solving: An ‘Addition & Subtraction’ Rich Task for Years 3–4 - Calculate

  • TLF-IDA004335

The aim of this task is to provide a rich, contextual activity through which students can begin to explore the addition and subtraction of one- and two-digit of numbers in everyday contexts.

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Text

Subtraction Year 3 & 4 - Calculate

  • TLF-IDA004297

This activity is designed to encourage students to develop and explain different strategies to solve subtraction problems.

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Text

Addition Year 3 - Calculate

  • TLF-IDA004289

This activity is designed to see if students are able to apply their addition strategies in order to find the total of their collection of cards. Often students will have a method for adding two numbers, but when asked to add a list of numbers they revert to less efficient methods.

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Text

Addition Strategies - Calculate

  • TLF-IDA004285

Regular practise of addition facts can help children build their confidence in maths.

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Text

Subtraction Strategies - Calculate

  • TLF-IDA004283

This game gives students opportunities to practice subtraction skills and to learn subtraction strategies, including the jump strategy, the split (or partition) strategy, compensation and the count-up to strategy (sometimes called the Shopkeeper’s method).

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Text

Addition and Subtraction - Calculate

  • TLF-IDA004282

This game focuses on addition, subtraction and estimation. It can be played many times as the totals will often be different and the focus of the mathematics can change. There is a video included to help with how to play the game.

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Downloadable

AERO Ochre Maths Year 3 Unit 2 - Exploring calculation strategies

  • TLF-IDA003872

This sequence of 15 lessons will teach students various calculation strategies.

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Text

Work sample Year 3 Mathematics: Clean our school

  • TLF-IDA004050

This work sample demonstrates evidence of student learning in relation to aspects of the achievement standards for Year 3 Mathematics. The primary purpose for the work sample is to demonstrate the standard, so the focus is on what is evident in the sample not how it was created. The sample is an authentic representation ...

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Work sample Year 3 Mathematics: Ways to make 18

  • TLF-IDA004049

This work sample demonstrates evidence of student learning in relation to aspects of the achievement standards for Year 3 Mathematics. The primary purpose for the work sample is to demonstrate the standard, so the focus is on what is evident in the sample not how it was created. The sample is an authentic representation ...

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Online

Patterns and number facts: Year 3 – planning tool

  • TLF-IDA003301

This planning resource for Year 3 is for the topic of Patterns and number facts. Students extend and apply knowledge of number facts to 20 for addition and subtraction and extend to larger numbers. They demonstrate proficiency with multiplication facts for 3, 4, 5, and 10 and further develop their knowledge of related division ...

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Video

BTN: What is an abacus?

  • TLF-IDM021154

An abacus is a tool that helps people solve maths problems. Why might some people still use, and encourage the use of, an abacus when there are more contemporary tools like calculators?

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Interactive

Sites2See: Patterns and Algebra

  • TLF-IDM016224

Selected links to a range of interactive online resources for the study of patterns and algebra in Foundation to Year 6 Mathematics.

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Text

Domino Bingo - Calculate

  • TLF-IDA004366

In this game, students add single digit numbers and subitise domino dot patterns.

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Text

ROWCO - Calculate

  • TLF-IDA004358

ROWCO is a card game that will help students practice their addition facts while playing an engaging strategy game.

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