3.1.5
Method E - Column Method
Complete the interactive activities in the Seneca app to work towards your CPD certificate.
Column Method: Expand and Simplify (x + 3)(x − 5)
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Step 1
- Write (x + 3)(x − 5) in two rows, in a layout similar to a column multiplication.
,h_400,q_80,w_640.png)
Step 2
- Now start by multiplying the x + 3 by −5.
,h_400,q_80,w_640.png)
Step 3
- Next, multiply the x + 3 by x.
- When you write your answer, make sure you line up the x terms with the x terms in the previous line.
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Step 4
- Now add the two products, column by column.
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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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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