# Maths GCSE

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- Created by: Freya.corbett
- Created on: 24-05-16 13:52

Formula for finding Distance

Distance= Speed x Time

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Formula for finding Time

Time= Distance/Speed

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Formula for finding Speed

Speed = Distance/Time

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Iain walked from his parents' farm into town at a steady speed of 5km/h. The journey took 3 hours. How far did Iain walk?

Distance = Speed x Time. Distance = 5 x 3. Distance = 15km

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Shona cycles at an average speed of 8km/h. How far has she travelled if she cycles for 4 hours?

Distance = Speed x Time. Distance = 8 x 4. Distance = 32km. Shona has travelled 32km.

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Kelly runs from 4.50pm until 5.20pm at an average speed of 7km/h. How far did she go?

Distance = Speed x Time. Distance = 7 x 0.5. Distance = 3.5km. Kelly ran 3.5km.

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Alan travels 100km in 5hrs. Find his average speed in km/h.

Speed = Distance/Time. Speed = 100 \ 5. Speed = 20km/h. Alan's average speed is 20km/h

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Scott cycles at 4mph and covers a distance of 13 miles. How long does his journey take?

Time = Distance/Speed. Time = 13 \ 4. Time = 3.25hrs. But we don't write 3.25 hours. The answer should be in hours and minutes. So the answer is 3hrs 15mins.

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How do we know if we round up or down?

The rule is, if the next digit is: 5 or more, we 'round up'. 4 or less, it stays as it is.

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23745 to the nearest thousand

24000.

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23745 to the nearest hundred

23700.

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What is 23745 rounded to the nearest ten?

23750.

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Write 2.6470588 to 2 decimal places (dp).

2.65

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Round off the number 3.9762645 to 1 dp.

4.0

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What does the word significant mean?

having meaning

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What would you get if you wrote the number 368249 correct to 1 significant figure?

400000

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What would you get if you wrote the number 0.00245 correct to 1 significant figure?

0.0000059

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What is 7.994 to two significant figures?

8.0

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How would you get an approximate answer for Equation: 386062 x 0.007243 ?

Equation: 400000 x 0.007 = 2800

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What is a ratio?

A ratio is a way to compare amounts of something.

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There are 15 girls and 12 boys in a class. What is the ratio of girls to boys? Give your answer in its simplest form.

So the simplest form of the ratio is 5:4

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A newspaper includes 12 pages of sport and 8 pages of TV. What is the ratio of sport to TV? Give your answer in its simplest form.

The answer is 3:2.

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Anna has 75p. Fiona has 1.20 . What is the ratio of Anna's money to Fiona's money, in its simplest form?

So the ratio is 5:8.

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Twelve pencils cost 72p. Find the cost of 30 pencils.

30 pencils cost 1.80 .

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Jenny buys 15 felt-tip pens. It costs her 2.85 . How much would 20 pens have cost?

The answer is 3.80 .

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What is a prime number?

A number that can only be divided by 1 and its self.

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What are the first 10 prime numbers?

2,3,5,7,11,13,17,19,23 and 29.

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What does this sign mean '='

Equals

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What does this symbol mean '>' ?

Less than

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What does this symbol mean '

More than

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Divide 9.1 by 7

1.3

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Divide 6.4 by 0.4

6.4 / 0.4 = 16

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Divide 5.39 by 1.1

4.9

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3.5 × 19

66.5

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9.2 × 0.8

7.36

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Subtract 0.03 from 1.1

1.07

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7.005-0.55

6.455

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Add 1.452 to 1.3

2.752

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Add 3.25, 0.075 and 5

8.325

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What do two fractions have to have the same of when adding and subtracting?

The same common denomintar

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1/5 + 2/5

3/5

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5/6 - 1/6

4/6 = 2/3

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1/4 + 2/5

13/20

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2/3 - 1/4

BULLSHIT .......................................................................................5/12

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(True or False) The inequality |x + 1| < 0 has no solution.

TRUE

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(True or False) If a and b are negative numbers, and |a| < |b|, then b - a is negative.

TRUE

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(True or False) The equation 2x + 7 = 2(x + 5) has one solution

FALSE (2x + 7 = 2x + 10 , 7 = 10 no solution)

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## Other cards in this set

### Card 2

#### Front

Formula for finding Time

#### Back

Time= Distance/Speed

### Card 3

#### Front

Formula for finding Speed

#### Back

### Card 4

#### Front

Iain walked from his parents' farm into town at a steady speed of 5km/h. The journey took 3 hours. How far did Iain walk?

#### Back

### Card 5

#### Front

Shona cycles at an average speed of 8km/h. How far has she travelled if she cycles for 4 hours?

#### Back

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