Year 9 Numeracy Skills NA4

L4

Lim made this pattern of rectangles using matches.

What is the rule used for the number of rectangles and the number of matches?

• number of matches = 6 x number of rectangles

• number of matches = 5 x number of rectangles - 1

• number of matches = 5 x number of rectangles + 1

• number of matches = 6 x number of rectangles - 1

Tags

CCSS.5.OA.B.3

L4

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Tags

CCSS.8.F.A.1

CCSS.HSF.IF.A.1

L4

James wrote this pattern of numbers: 3, 11, 43, 171, _______.

What is the rule James used?

• Multiply by 3 then add 4

• Multiply by 4 then subtract 1

• Multiply by 5 then subtract 4

• Square and then add 2

Tags

CCSS.5.OA.B.3

L5

The rule for a pattern is 'double the previous number and add 5'. if the first number in this pattern is 2, what is the fourth number?

Tags

CCSS.5.OA.B.3

L5

The cost in dollars to print  $n$  books is  $500+10n$  . How many books are printed for a cost of $15 000?

Tags

CCSS.7.EE.B.4A

L5

A factory makes garden gnomes. The total cost, $C, of producing n gnomes is given by $C=350+25n$ . The factory receives $35 for each garden gnome. In a week where the factory produces and sells 180 gnomes, how much profit will it make?

L5

Young's rule is a formula that determines the correct dose of medicine for a child when the adult dose of that medicine and the age of the child are known. The rule is $C=\frac{nA}{n+12}$  where  $C$  is the child's dose in millilitres,  $n$  is the child's age in years and  $A$  is the adult dose in millilitres. 

What is the correct dose for a four years old child when the adult dose is 20 mL?

Tags

CCSS.7.EE.B.4A

L6

This balance shows that 4 blocks have the same mass as 2 balls and a block. How many blocks would balance 6 balls?

• 3

• 7

• 9

• 10

Tags

CCSS.3.MD.A.2

L6

What is the area of the shape?

• $\left(a-c\right)\times\left(b-2c\right)$

• $\left(a\times c\right)-\left(5\times c\right)$

• $\left(a\times b\right)-\left(c\times c\right)$

• $\left(a+c\right)\times\left(b+2c\right)$

L6

This is a plan of a yard. The area of the paving, in square metres, is

•  $12x-5y$  

•  $12y-5x$  

•  $2xy-60$  

•  $xy-60$