Mastering Whole Number Operations

Year 8 Mathematics Building Strong Number Skills 30-minute lesson

WALT - We Are Learning To

Add, subtract, multiply, and divide whole numbers using formal written algorithms Understand and apply step-by-step procedures accurately Check the reasonableness of our answers

Success Criteria

I can follow algorithms to perform addition, subtraction, multiplication, and division with whole numbers I can explain and demonstrate the steps in each calculation clearly I can check the reasonableness of my answers I use manipulatives or colour-coded aids to support my calculations if I need to

The Four Operations: Our Mathematical Toolkit

Colour-Coded Algorithm Practice

Work in pairs with your manipulatives Follow the colour-coded steps on your worksheet Red for carrying/regrouping Blue for main calculations Green for checking your work

Strategies for Success

{"left":"Use place value to line up numbers correctly\nShow all your working steps clearly\nDouble-check by using the inverse operation","right":"Use manipulatives when numbers feel abstract\nRead the problem twice before starting\nEstimate your answer first to check reasonableness"}

Challenge Question

A school has 8 classes with 24 students in each class. If they order 250 books for the library, how many books will each class get if they share equally? What operations will you need to use? What's your estimate before calculating?

Reflection & Next Steps

What helped you calculate accurately today? Which step do you find most challenging? How will you use these skills in other subjects? Extension: Create your own multi-step word problem for a classmate