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Teach students to estimate the product of a decimal and a two- or three-digit number with this complete teaching bundle. Students round the decimal to the nearest whole number and the other number to the nearest 10, multiply using a multiple of 10, compare estimates with exact answers and judge whether an answer is reasonable.

Combining a lesson plan, a 46-slide editable teacher presentation, three differentiated student activities, an exit ticket with interpretation guide and a hands-on Shopping Trolley Estimate Dash game, this curriculum-aligned bundle provides everything you need to teach the lesson from start to finish.

Built around the I Do, We Do, You Do model, students move from explicit teacher modelling to guided practice and independent application. They round decimals and whole numbers, use the four steps round, rewrite, estimate, solve and compare, estimate costs in real-world problems, choose the most reasonable estimate and explain why an estimate is useful when an exact answer is not needed.

What's included in this teaching bundle?

Teacher Slides (PowerPoint)

• 46 editable, ready-to-teach slides following the I Do, We Do, You Do structure
• Clear learning intention and success criteria
• Review of multiplying by powers of 10 and strategies to multiply by a multiple of 10
• Rounding to the nearest 10 and rounding a decimal to a whole number on number lines
• Modelled examples using a four-step estimation organiser
• Real-world estimation, estimate-first and most-reasonable-estimate tasks
• Every question slide followed by an answer slide
• Mini whiteboard check-ins throughout

Lesson Plan and Exit Ticket (PDF)

• Complete I Do, We Do, You Do lesson plan for a 45 to 60 minute lesson
• Diagnostic, formative and summative assessment points
• Key vocabulary, teacher notes and common misconceptions
• Exit ticket (two per page) with an interpretation guide

Differentiated Student Activities (PDF)

• Activity overview to help you match each option to your students
• Three differentiated activities: Rounding and Estimating Products, Estimating with Two- and Three-Digit Numbers and Estimating in Real-World Problems
• Rounding tables and a matching task on the supported activity
• Estimate-then-check tables, real-world problems and missing-number reasoning questions
• Answer key and marking guide for every activity

Class Recording Sheet (Excel)

• Type T, A or B and the cell colours itself: Working towards, Achieving, Working beyond
• Exit ticket results and activity evidence tabs, with numbered next teaching steps

Hands-On Activity: Shopping Trolley Estimate Dash (PDF)

• 20 trolley cards with a price and a quantity to estimate against a 15-second timer
• How-to-play page with an 8-round estimate record
• Fill the trolley final round: choose 3 of 5 cards for a trolley mat and get as close to a $1000 budget as possible without going over
• Teacher page with set-up, a model round, differentiation and misconceptions
• Answer page with the estimate and exact total for every trolley
• What you need: printed cards and mats, scissors, calculators, a timer and mini whiteboards

Ideal for upper primary classrooms, this bundle provides a structured approach to estimating decimal multiplication, combining explicit instruction, visual number lines, differentiated independent practice and an engaging hands-on estimation game.

Formats: PowerPoint, PDF and Excel

Aligned to Australian Curriculum: Multiply and divide decimals by multiples of powers of 10 without a calculator, applying knowledge of place value and proficiency with multiplication facts; using estimation and rounding to check the reasonableness of answers (AC9M6N06)

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