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.
- $-2(-x-5)$
  
  ⇔
  
  $2x+10$ ✓
- $-2(x+5)$
  
  ⇔
  
  $-2x-10$ ✓
- $-2(x-5)$
  
  ⇔
  
  $-2x+10$ ✓
- $-2(5-x)$
  
  ⇔
  
  $2x-10$ ✓

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.