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Grid method for multiplication
24 x 38 = (20 + 4)(30 + 8)
30 8
600 160
20
120 32
4
24 x 38 = 600 + 160 + 120 + 32 = 912…read more

Slide 3

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Multiplying out two brackets
(x + 4)(x + 8)
x 8
x2 8x
x
4x 32
4
(x + 4)(x + 8) = x2 + 8x + 4x + 32
= x2 + 12x + 32…read more

Slide 4

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Multiplying out two brackets
(x + 3)(x + 9)
x 9
x2 9x
x
3x 27
(x + 3)(x3+ 9) = x2 + 3x + 9x + 27
= x2 + 12x + 27…read more

Slide 5

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Revision of multiplying negative numbers
1. Write down the rules for multiplying
and dividing with negative numbers.
2. -5 x 6 =
3. 14 x ­3 =
4. -8 x ­7 =
5. Solve ­3a = 24
6. Solve 5a = -15
7. Solve -9a = -270…read more

Slide 6

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Revision of simplifying with negative
coefficients
1. -5a + 7a =
2. -14a ­ 3a =
3. ...... + 8a = -15a
4. -10a - ...... = 17a…read more

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