VC2M3N04
add and subtract two- and three-digit numbers using place value to partition, rearrange and regroup numbers to assist in calculations without a calculator
- using partitioning and part-part-whole models and the inverse relationship between addition and subtraction to solve addition or subtraction problems, making informal written ‘jottings’ to keep track of the numbers if necessary
- using physical or virtual grouped materials or diagrams to make proportional models of numbers to assist in calculations, for example, to calculate 214 + 325, representing 214 as 2 groups of 100, one group of 10 and 4 ones and 325 as 3 groups of 100, 2 groups of 10 and 5 ones, resulting in 5 groups of 100, 3 groups of 10 and 9 ones, which is 539
- choosing between standard and non-standard place value partitions to assist with calculations, for example, to solve 485 + 365, thinking of 365 as 350 + 15, then adding the parts, 485 + 15 = 500, 500 + 350 = 850
- solving subtraction problems efficiently by adding or subtracting a constant amount to both numbers to create an easier calculation; for example, 534 − 395, adding 5 to both numbers to make 539 − 400 = 139
- justifying choices about partitioning and regrouping numbers in terms of their usefulness for particular calculations when solving problems
- applying knowledge of place value to assist in calculations when solving problems involving larger numbers; for example, calculating the total crowd numbers for an agricultural show that lasts a week
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2-Digit Subtraction with Regrouping - Printable Math Mat
Explore subtraction with regrouping using a printable math mat and MAB blocks.
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Rounding Numbers on Vertical Number Lines Matching Activity
Practise rounding to the nearest ten and hundred on a vertical number line with this set of 36 match-up cards.
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Rounding on Number Lines Interactive Mystery Picture Activity
Karate chop those rounding standards with a fun Rounding on a Number Line Mystery Reveal activity.
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Rounding Using a Vertical Number Line Posters
Display how to round numbers to different places using a vertical number line with a set of posters.
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Number Talks - Building Numbers Task Cards
Build number sense skills with this set of 24 task cards.
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4-Digit Place Value Card Game - Race to 10 000
A fun game for students to play in small groups to consolidate their understanding of adding and subtracting in groups of 10, 100 and 1000.
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Rounding Whole Numbers Game — Create-Your-Own!
Share this "create-your-own" rounding whole numbers game with your students to give them practise rounding numbers up to the hundred thousands place.
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Rounding to 10, 100, and 1000 Worksheet — Halloween Colour-By-Number
Round each number to the place of the underlined digit with a fun Halloween colour-by-number worksheet.
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Rounding Rainbow Classroom Poster & Differentiated Worksheet Pack
Download a set of differentiated rounding worksheets and accompanying poster for your maths classroom.
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Adding within 1000 Addition Strategy Task Cards
Practise using a number of addition strategies to add numbers within 1000 with this set of task cards.
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2 Digit Subtraction Model Match-Up
Use a rigorous subtraction matching game to match subtraction word problems with number sentences, bar models, and solutions.
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Rounding Numbers to the Thousands Place Task Cards
Teach students to round numbers up through the thousands place with a set of 24 task cards.
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The Addition Quest – Whole Class Game
Find the hidden gems and place their numbers into the correct positions on the worksheet to solve the sums.
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Crazy Boxes – 10 Times Tables
A fun multiplication worksheet where students create a colour pattern using 10 times tables.
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Place Value Cards - 10 000, 1000, 100, 10, 1
Explore and expand 4 and 5-digit numbers with a set pf printable place value cards and suggested activities for small group instruction.
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Adding within 1000 Bar Model Match Up Activity
Practise using the bar diagram to add numbers within 1000 with this match up activity.
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3 Digit Subtraction Game- Mathzee!
Practise subtracting 3-digit numbers with and without regrouping with a fun game of Subtraction Mathzee!
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2-Digit Subtraction Using Bar Models - Task Cards
Review and assess your students’ subtraction skills with a set of 2-digit subtraction task cards focusing on using the part-part-whole model.
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Subtraction using Place Value Disks- Interactive Slides
Practise subtracting multiples of 100 using place value disks with an interactive drag-and-drop activity.
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Rounding Task Cards (Numbers to 100 000)
Use place value knowledge and vertical number lines to round numbers up through the hundred thousands place with a set of 24 task cards.
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Subtracting 2-Digit Numbers Task Cards
Practice 2-digit subtraction with this set of 18 task cards.
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Addition Detectives PowerPoint
An engaging 43-slide PowerPoint styled as a detective story in which students are tasked with using different addition strategies to uncover suspects.
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Polygon Puzzles - Subtraction Worksheets with Answers
Line the sum up with the corresponding answer.
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Number Matching Puzzle - Subtraction
A hands-on game to play when learning about subtracting numbers.