3.1.6
Method F - Vertical & Crosswise
Complete the interactive activities in the Seneca app to work towards your CPD certificate.
Vertical and Cross: Expand and Simplify (x + 3)(x − 5)
Step 1
- Write (x + 3)(x − 5) in two rows, in a similar way to a column multiplication.
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Step 2
- First, multiply vertically.
- The first two terms in each expression are multiplied together and the product is written at the bottom.
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Step 3
- Now, multiply vertically again – this time the last two terms in each expression are multiplied together and the product is written at the bottom.
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Step 4
- Finally, the ‘crosswise’ part.
- Multiply diagonally and add the two products.
Well done!
Thank you for completing our CPD course. We hope you've enjoyed it and that it has given you some ideas for your own classroom.
1Course Overview
1.1Course Structure & Commonly Asked Questions
2Subtraction: KS2/3
2.1Subtraction Methods
2.1.1Method A - Decomposition Method2.1.2Method B - Equal Addition Method2.1.3Method C - Expanded Form Method2.1.4Method D - Partitioning Method2.1.5Method E - Counting-Up Method2.1.6Method F - Constant Difference Method2.1.7Method G - Partial Differences Method2.1.8Method H - Complementary Method2.1.9Method I - Nines Complement Method
3Expanding Double Brackets: KS3/4
Jump to other topics
1Course Overview
1.1Course Structure & Commonly Asked Questions
2Subtraction: KS2/3
2.1Subtraction Methods
2.1.1Method A - Decomposition Method2.1.2Method B - Equal Addition Method2.1.3Method C - Expanded Form Method2.1.4Method D - Partitioning Method2.1.5Method E - Counting-Up Method2.1.6Method F - Constant Difference Method2.1.7Method G - Partial Differences Method2.1.8Method H - Complementary Method2.1.9Method I - Nines Complement Method
3Expanding Double Brackets: KS3/4
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