Multiplying an expression by a constant | Maths | Quizalize & Oak National Academy

Starter quiz

In the expression $y+8$ , the $y$ term is a variable and the $8$ term is a ______.

'constant' ✓
Which of these identities match the bar model shown?

$4 \times e + 7 \equiv 4e + 7$

$4(e + 7) \equiv 4e + 28$ ✓

$e + 7\times 4 \equiv e + 28$

$(e+7) \times 4 \equiv 4e + 28$ ✓
In this area model, what is under these two ink splats?

$5 +x$ and $8$

$5x$ and $3$

$5x$ and $8$

$5x$ and $15$ ✓

$3x$ and $15$
Match the expressions.

$5(x+4)$

⇔

$5x+20$ ✓

$4(x+5)$

⇔

$4x+20$ ✓

$10(x+2)$

⇔

$10x+20$ ✓

$2(x+10)$

⇔

$2x+20$ ✓

$10(x+4)$

⇔

$10x+40$ ✓

$4(x+10)$

⇔

$4x+40$ ✓
Expand $4(t-7)$

$4t-28$ ✓

$4t-7$

$-4t-28$

$4t-3$
Match the expressions.

$-2(-x-5)$

⇔

$2x+10$ ✓

$-2(x+5)$

⇔

$-2x-10$ ✓

$-2(x-5)$

⇔

$-2x+10$ ✓

$-2(5-x)$

⇔

$2x-10$ ✓

Loading worksheet ...

Loading presentation ...

3(y+2) expands to 3y+2.

3 lots of 12 isn't 3x10+2 so 3 lots of (y+2) isn't 3y+2. Get students to draw this out. To visualise it.