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

Starter quiz

The expression $2x+5y-1$ can not be ______ further.

'simplified' ✓
Match each expression to its simplified form.

$5 \times y$

⇔

$5y$ ✓

$5 \times x$

⇔

$5x$ ✓

$x \times y$

⇔

$xy$ ✓

$-5 \times y$

⇔

$-5y$ ✓

$x \times -5$

⇔

$-5x$ ✓
Which of the below will correctly evaluate $6 \times 82$ ?

$6 \times 8 + 2$

$6 \times 8 + 6 \times 2$

$6 \times 80 + 2$

$6 \times 80 +6 \times 2$ ✓
Simplify $4 \times 2a$ .

$6a$

$8a$ ✓

$4a^2$

$6a^2$

$8a^2$
Match the expressions.

$3 \times -4a$

⇔

$-12a$ ✓

$3 \times -4b$

⇔

$-12b$ ✓

$-3 \times -4a$

⇔

$12a$ ✓

$-6b \times -2$

⇔

$12b$ ✓

$-3 \times 2a \times -2b$

⇔

$12ab$ ✓

$-3 \times -2a \times -2b$

⇔

$-12ab$ ✓
Which of these is the correct simplification of the expression $-y \times y + 5 \times y \times (-3) \times y$ ?

$15y^4$

$-16y^2$ ✓

$-y^2+2y$

$16y^2$

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.

$-2(-x-5)$

⇔

$2x+10$ ✓

$-2(x+5)$

⇔

$-2x-10$ ✓

$-2(x-5)$

⇔

$-2x+10$ ✓

$-2(5-x)$

⇔

$2x-10$ ✓

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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.