y9.Ratio

y9.Ratio

By Mark Roles

Multiple Choice

¹⁄₂ × ³ ⁄₄ =

• ³⁄₈
• ³⁄₄
• ¹⁄₂
• ¹⁄₄

Multiple Choice

⁴⁄₅ × ¹⁰⁄₁₂ =

• ⁴⁰⁄₅₀
• ¹⁄₃
• ⁵⁰⁄₄₈
• ²⁄₃

Multiple Choice

³⁄₄ ÷ ¹⁄₂ =

• ³⁄₂
• ⁶⁄₈
• ³⁄₈
• ¹⁄₂

Multiple Choice

Solve.  
3/5 + 1/4 = 

• 5/20
• 12/20
• 7/20
• 17/20

Multiple Choice

Subtract and simplify if you can.
2/4 - 3/8

• 1/8
• 5/4
• 4/32
• 1/2

Multiple Choice

3/8 + 1/3

• 4/11
• 4/24
• 17/24
• 1/6

12.1: Sharing a total by a ratio

You already know how to share in a ratio

Simplifying Ratios​

When simplifying ratios, make sure that they are in the same units.

​

e.g. A recipe has 1.5kg of flour and 300g of sugar. Express this in simplest form.

1.5kg = 1500 g

1500: 300

15:3

5:1​

Sharing in a ratio

When we know the part, but need to find total

Some text here about the topic of discussion

Sharing in a ratio

Some text here about the topic of discussion

Ali has 4 parts and this equals $32

each part = 32/4 = $8

​

there are a total of 15 parts

15 x 8 = $120​

Ratio when given one quantity​

https://youtu.be/boFsvYAySo8​

Multiple Choice

Jerry makes concrete. he uses Cement, sand and gravel in the ratio 1:2:4.

For one wall he uses 15kg of sand.

How much gravel does he use?

• 15kg

• 7.5kg

• 30kg

• 52.5kg

Multiple Choice

Jerry makes concrete. he uses Cement, sand and gravel in the ratio 1:2:4.

For one wall he uses 15kg of sand.

How much concrete does he make?

• 15kg

• 7.5kg

• 30kg

• 52.5kg

Multiple Choice

Xavier makes some green paint. He mixes yellow, blue & white to the following ratio, 4:5:1

He uses 600ml of yellow paint. How much blue paint does he use?

• 750ml

• 150ml

• 600ml

• 1.2l

Now we will have some questions from a range of topics

​

Spiral Review

Multiple Choice

Round 36.7 to the nearest whole number.

• 36

• 40

• 30

• 37

Multiple Choice

Round 0.246 to one decimal place.

• 0.2

• 0.24

• 0.25

• 0.26

Multiple Choice

Round 368 to one significant figure.

• 300

• 370

• 400

• 4

Multiple Choice

Round to 0.2593 to 2 significant figures.

• 0.26

• 0.3

• 25

• 0.29

Multiple Choice

An electricity company uses the formula below to calculate bills. How much is Scott's bill if he uses 350 units of electricity? Give your answer in pence [p].

$$c\ =\ 16n\ +\ 15$$   c = cost in pence [p] n = number of units of electricity used

• 16365p

• 5615p

• 381p

• 56.15

Multiple Choice

What is the y-intercept of this line?

• 7

• -3

• 6

• -5

Multiple Choice

What is the gradient of this line?

• 6

• -3

• -2

• 2

Multiple Choice

What is the equation of the straight line shown below?

• y = 6x + 2

• y = 2x + 6

• 6x + 2

• 2x + 6

Multiple Choice

A box contains 12 purple marbles, 8 white marbles and 16 blue marbles. What is the ratio of purple to white to blue marbles in its simplest form?

• 12:8:16

• 3:2:4

• 6:4:8

• 2:3:4

Multiple Choice

Work out 4% of 300

• 3

• 12

• 30

• 120

Multiple Choice

Work out 14% of 600kg

Give your answer in kilograms (kg).

• 60

• 6

• 24

• 84

Multiple Choice

A jug contained 600ml of water. Thomas then increased the amount of water in the jug by 13%.

How much water was in the jug after the increase?

Give your answer in millilitres.

(ml).

• 78 ml

• 522 ml

• 687 ml

• 678 ml

Multiple Choice

A recycling bin contains 3kg of plastic and 500g of paper. What is the ratio of plastic to paper in the bin? Give your answer in its simplest form.

• 3:500

• 3000:500

• 30:5

• 6:1