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Give Year 3 students a flexible toolkit for adding larger numbers. This complete unit explicitly teaches the split strategy, jump strategy, compensation and the written algorithm before students compare methods, explain their reasoning and check whether an answer is reasonable.

The editable 26-slide presentation provides five sequenced lessons with worked examples. Five colour strategy posters support classroom reference, while the Strategy Sort and Solve activity and Race to 1,000 game add collaborative practice. Eight black-and-white worksheet pages move from two-digit to three-digit addition and include matching answer pages. The editable 10-question quiz, two-page assessment, answer pages and five-level rubric provide a clear assessment pathway.

The unit is designed for approximately one teaching week. Teachers can use the full sequence or select individual posters, games and practice pages for small-group support, whole-class consolidation, homework or extension.

What's Included

• Editable PowerPoint presentation: Addition Strategies — 26 slides across five lessons

• Editable PowerPoint quiz: Addition Strategies — 22 slides with 10 question-and-answer pairs

• Unit plan PDF — 31 pages

• Addition Strategy Toolkit Posters — Split Strategy, Jump Strategy, Compensation, Written Algorithm, and Choose, Solve and Check

• Strategy Sort and Solve Activity — colour strategy mats and equation cards

• Race to 1,000 Addition Strategy Game — colour game board and addend cards

• Split Strategy Practice — 2 pages plus 2 answers

• Jump Strategy Practice — 2 pages plus 2 answers

• Compensation with Friendly Numbers — 1 page plus 1 answer

• Written Algorithm with Regrouping — 2 pages plus 2 answers

• Choose and Explain a Strategy — 1 page plus 1 answer

• Addition Strategies Assessment — 2 pages plus 2 answers

• Addition Strategies Rubric — 1 landscape page

Learning Focus

• Partition two- and three-digit addends by place value.

• Add efficiently using place-value jumps.

• Adjust to friendly numbers and compensate accurately.

• Record regrouping correctly with the written algorithm.

• Select an efficient strategy and explain mathematical reasoning.

• Check whether an answer is reasonable.

Classroom Use

Use the presentation for explicit teaching, the colour posters for reference, and the sorting activity and game for paired or small-group consolidation. The practice pages can be assigned as a sequence or selected for support, core and extension groups. Finish with the editable quiz, two-page assessment and rubric.

Product Details

Year level: Year 3
Subject: Mathematics
Topic: Efficient mental and written addition strategies with two- and three-digit numbers

Curriculum Alignment

Australian Curriculum v9.0
AC9M3A02

Australian Curriculum v8.4 / Western Australia
ACMNA055

Victorian Curriculum 2.0
VC2M3A02

NSW Curriculum
MA2-RN-01
MA2-RN-02
MA2-AR-01
MA2-AR-02

Common Core State Standards
CCSS.MATH.CONTENT.3.OA.C.7
CCSS.MATH.CONTENT.3.NBT.A.2
CCSS.MATH.CONTENT.3.OA.D.8
CCSS.MATH.CONTENT.3.OA.A.3

England National Curriculum
UK-LKS2-Y3-MATH-N-A
UK-LKS2-Y4-MATH-N-A

New Zealand Curriculum
NZ-Y3-MATH-NUM-OP-4
NZ-Y4-MATH-NUM-OP-3
NZ-Y4-MATH-ALG-ER-1

Texas Essential Knowledge and Skills
TEKS-MATH-G3-4A
TEKS-MATH-G3-5A
TEKS-MATH-G3-4B
TEKS-MATH-G3-4F

Ontario Mathematics Curriculum
CAN-G3-MATH-B2.3
CAN-G3-MATH-B2.2
CAN-G3-MATH-B2.5

Formats, Page Counts and Answers

Instructional extent: 31-page unit plan, 26-slide presentation and 22-slide quiz — 79 instructional pages/slides total
Answer key: Yes — 10 matching answer pages

Teacher Benefits

• One coherent sequence connects mental and written addition methods.

• Worked examples and posters give students consistent strategy language.

• Two hands-on resources provide alternatives to worksheet-only practice.

• Two- and three-digit practice supports progression within the year level.

• Matching answers, quiz, assessment and rubric simplify checking and reporting.

Digital Product and Licence

This is a digital product. No physical item is supplied or shipped. Purchase permits use by the individual purchaser in their own classroom or homeschool setting. Files may not be shared, resold, uploaded to shared drives for others, or redistributed in whole or in part.