GCSE Science Week One Homework

Put these numbers in order of size

• -3

• 1.2

• -28

• 17

Answer explanation

The more negative a number is, the smaller it is.

For example -28°c is colder then -5°c because -28°c is a lower number.

• 40

• -40

• 22

• -22

Answer explanation

Remember that we do the multiplication before the subtraction:

4 x -5 = -20

-20 -2 = -22

5 × (10 - 2)

• 40

• 48

• 36

• 32

Answer explanation

Brackets come before multiplication in BIDMAS.

10 - 2 = 8

5 X 8 = 40

A company offers broadband for a one off charge of £60 for the first 3 months, then £28 per month after that.

How much would it cost for 12 months?

• £144

• £88

• £312

Answer explanation

3 Months cost £60 on the initial offer

There are 9 months left of the year to pay for.

9 x £28 = £252

£252 + initial payment

= £252 +£60 = £312

What is 4199 to the nearest 1,000?

Mathematical Equivalence

ON

Answer explanation

4199 is closer to 4000 than 5000 so it rounds down to 4000.

Round 1.4 to the nearest whole number.

• 1

• 1.8

• 2

• 2.8

Answer explanation

1.4 is closer to 1 than to 2 so it rounds down.

Round 1.36801 to 1 decimal place

Mathematical Equivalence

ON

Answer explanation

Round the decimal 2.79 to one decimal place.

• 3

• 2.80

• 3.72

• 2.8

Answer explanation

Round 89.5 to the nearest whole number

• 89

• 90

• 89.6

• 91

Mark the point (4, -3) on the grid.

Answer explanation

Remember to go along the x axis first

then

go up or down the y axis

Alphabetical order

x then y