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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13 direct matches to ACMNA055 | 7 other related resources
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The difference bar: generate easy subtractions

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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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Interactive

Goat Crashers (Mental calculations with unconditional probability) - ABC Education

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Using your knowledge of different operations, join the Pig Posse to help kick them out before they eat everything. Or join the goats and move on in! Mathematical ideas and strategies this game supports: addition and subtraction with 1–30; multiples of 2, 3, 4, 5, 6, 8 and 10; dividing by 3, 4, 5, 6, 8 and 10.

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Interactive

Goat Grommets (Mental computation and dependent probability) - ABC Education

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As a team, you'll need to use your understanding of probability to decide which waves your surfer should catch — or when to play it safe and head in. Use mental addition to calculate your score. Enjoy the surf but watch out for the shark pig! Mathematical ideas and strategies this game supports: the probability of an occurrence ...

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Interactive

Thundergoats (Combinations for ten) - ABC Education

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As a team, use your knowledge of different strategies to find the total number of Thundergoats as efficiently as possible (e.g. use combinations for ten). Mathematical ideas and strategies this game supports: noticing how items are organised can help you work out their total (subitising). There are many ways to add and ...

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Subtraction Year 3 & 4 - Calculate

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

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Addition Year 3 - Calculate

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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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Subtraction Strategies - Calculate

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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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Addition and Subtraction - Calculate

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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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Interactive

Goat to bed (Partitioning twenty) - ABC Education

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Some naughty little goats should be in bed, but they are still up and playing games! You will need to choose teams, then use your strategies (such as combinations for 20) to decide who wins: baby goats or babysitter! Mathematical ideas and strategies this game supports: numbers can be partitioned in many ways; there are ...

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Pattern & Algebra Year 3 - Calculate

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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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Salute - Calculate

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

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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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Addition Strategies - Calculate

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

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Fractions in the real world

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How many quarters make up a whole? Watch this video to find out how else you can represent 2/4 and how to add up quarters to make a whole.

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BTN: What is an abacus?

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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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Video

What is a fractal?

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Do you know what a fractal is? Basically, fractals are never-ending patterns created by repeated mathematical equations. In this clip, Yuliya, a student at MIT (in the USA) describes the properties of fractals and shows you where they can be found in technology and nature. Have a good look at the world around you and see ...

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Gobbling Goblins

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Welcome to 'The Toadstool Bistro', the hottest diner in Goblin Town. Maître d' Grundle is in a panic! The Gobbling Goblins, three fierce food critics, have arrived at The Toadstool Bistro and they're determined to put your kitchen to the test! Your goal is to keep the food coming for these ghastly gourmets. Use your maths ...

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Video

Additive strategies: Video and teaching guide

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This video explores the use of computation strategies, rounding and estimation in real-world, additive situations. Use the video with the supporting teacher guide as a springboard to explore mathematical concepts. A range of strategies such as compensation and partitioning are demonstrated. Estimation and rounding are highlighted ...

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Race to... - Calculate

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This game challenges students to use their knowledge of place value to add and subtract random numbers in order to meet a target value.

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Decimals Year 3 & 4 - Calculate

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The focus of this activity is to find out what students know about addition of decimals and what are some of the different strategies students are able to use and explain. Do students prefer to use equations or do students rely more on empty number lines?

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