RPA y7 Forming expressions

I think of a number multiply it by 7 and minus 8. Which expression(s), if any, represents my number now?

• A: 7x - 8

• B: 7x - 56

• C: 7(x – 8)

• D: x – 56

Tags

CCSS.6.EE.A.2

CCSS.6.EE.B.6

I think of a number y, add 15 and multiply by 6. Which expression(s), if any, represents my number now?

• A: 6y + 15

• B: 6(y + 15)

• C: 6 x y + 15

• D: 6y + 90

Tags

CCSS.6.EE.A.2

CCSS.6.EE.A.3

CCSS.6.EE.B.6

I have a box of p pencils. I put 10 more pencils in the box, then share them all between my brother and my sister. How many do they each receive?

• A: p + 10/2

• B: (p + 10)/2

• C: p + 5

• D: p + 10

  2

Tags

CCSS.6.EE.A.2

CCSS.6.EE.A.3

CCSS.6.EE.B.6

Which algebraic expression represents

5 more than a

• a + 5

• a - 5

• 5a

•  $a^5$  

• a5

Answer explanation

In this case 'more than' means add

Tags

CCSS.6.EE.A.2A

Which algebraic expression represents

7 lots of a

• a + 7

• a - 7

• 7a

• $a^7$

• a7

Answer explanation

'lots of' means multiply.

Remember; we do not write the 'x' symbol when simplifying algebraic expressions.

Tags

CCSS.6.EE.A.2A

Which algebraic expression represents

8 less than g

• g + 8

• g - 8

• 8 - g

• 8g

• $\frac{8}{g}$

Answer explanation

Here 'less than' means subtract.




Note:

8 less than g is written as g - 8

g less than 8 is written as 8 - g

Tags

CCSS.6.EE.A.2A

Which algebraic expression represents

k shared between 3

• k + 3

• k - 3

• 3k

•  $\frac{k}{3}$  

•  $\frac{3}{k}$  

Answer explanation

k shared between 3

means

k divided by 3


In algebra we write a division as a fraction

Tags

CCSS.6.EE.A.2A

A school buys x chairs for £35 each and y tables for £80 each. Write an expression for calculating the total cost.

• $80x+35y$

• $115xy$

• $45xy$

• $35x+80y$

Tags

CCSS.6.EE.A.2

CCSS.6.EE.B.6

I think of a number n, I double n and subtract 2. Write this as an expression.

• $2n-2$

• $n-2$

• $n-4$

• $2n-4$

Tags

CCSS.6.EE.A.2

CCSS.6.EE.B.6

Alex has x cards. He gives 5 of them away. Write down an expression for the number of cards Alex has left.

• $x+5$

• $x-5$

• $5x$

• $5x-5$

Tags

CCSS.6.EE.A.2

CCSS.6.EE.B.6