1. Grid Method for Multiplying two Expressions in Algebra
Anne Gilleran

2. Learning Outcome: : To apply the grid method to multiply two brackets
Anne Gilleran

3. We are going to use the Grid Method to multiply the
Following: 30 5
2100
35 x 78 70
350
2730
240 40 8
1. 42 x 57
2. 84 x 95
3. 56 x 78
Anne Gilleran

4. Use the grid method to multiply the following.40 2
2000
42 x 57 50
100
2394
280 14 7
1. 42 x 57
2. 84 x 95
3. 56 x 78
2394
7980
4368

5. Area = What is the area of the whole plot the owner has to build on?
Anne Gilleran
What is the area of the whole plot the owner has to build on?
4 metres
6 metres
Area =
Free for reuse

6. Write down a simplified expression for the area of the land that is used.
4 metres
6 metres
Area =
Anne Gilleran

7. Learning Outcome: : To apply the grid method to multiply two brackets
14 x 16 10 4
100
+40
+60
+24
100 40 10
224 60 24 6
(x+4) (x+6) x +4 x²
+4x
+6x
+24 x² 4x x
3 term quadratic
x² +10x +24 6x 24 +6
Anne Gilleran

8. Learning Outcome: : To apply the grid method to multiply two brackets
(2x -3) (x+4) 2x -3 x²
-3x
+8x
-12
2x² x
-3x
Please follow this link to see these problems worked out
3 term quadratic
x² +5x -12 8x
-12 +4
(x+5) (x+4)
(x+6) (x+5)
(x+1) (x-3)
(x+5) (x-1)
(2x+5) (x+6)
(x+6) (x+5)
(x+2) (x-4)
(3x+1) (2x+4)
(3x+2) (4x-1)
(3x-5) (x-3)
Anne Gilleran

9. Progress check! 6x² +7x +2 5x² +7x +3 6x² +8x +2 5x² +8x +3 2x 6x² +3x
Try the following question……. 2x
(2x+1) (3x+2) +1
6x²
+3x
What is the correct expansion? 3x
6x² +7x +2
5x² +7x +3
6x² +8x +2
5x² +8x +3
+4x 2 +2
Anne Gilleran

10. RATING SCALE
Anne Gilleran

11. I Don’t Understand how to multiply double brackets
Emoji Bottom Sad
I AM SAD
I Don’t Understand how to multiply double brackets
Anne Gilleran

12. Emoji Bottom OK I AM JUST OK Anne Gilleran
I know how to set up the grid
I am still making mistakes when multiplying
Anne Gilleran

13. Emoji Bottom Happy I AM HAPPY Anne Gilleran
I understand how to set up the grid
I can multiply each box correctly
I can simplify the terms correctly and get the correct answer nearly always.
Anne Gilleran

14. 3x + 1 2x + 3 x² +5x +6x +30 x² 5x x² +11x +30 6x 30 6x² +2x +9x +3
3 term quadratic
x² +11x +30 6x 30 +6
(3x+1) (2x+3) 3x
+ 1
6x²
+2x
+9x +3 2x
6x² 2x
3 term quadratic
6x² +11x +3
+ 3 9x 3
Anne Gilleran

15. 4x +7 3x +2 2x +3
What is the expression for the area of this plot of land?
This plot of land is perfectly square. Write an expression for the area of this plot.
Anne Gilleran

16. Progress check! 4x² -2x -2 3x² -10x -8 3x² +14x +8 3x² -10x -2 3x 3x²+2
3x² 2x
What is the correct expansion? x
4x² -2x -2
3x² -10x -8
3x² +14x +8
3x² -10x -2 -4
-12x -8
Anne Gilleran

17. Learning Outcome: : To apply the grid method to multiply two brackets
Expand and simplify
I am able to expand double brackets using the grid method.
(x-2)(x+3)
I am able to expand double brackets with numerical coefficients.
(3x+2)(2x+5)
Write an expression for the area.
I am able to apply to problems in context. 2x
+3q 3x +q
Anne Gilleran

18. Reflect time I am really pleased with... Today I have tried to...
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Reflect time
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