# Homework Term 4 Week 2

How can you save energy at home. It is good for our environment to save energy as well as saving your parents money.

Make a poster to hang on your fridge at home which will remind you all how to save energy.

http://www.tvakids.com/electricity/conservation.htm

# Solar Energy

What is solar energy and how could we use it as a resource to power the things we use every day?

Solar energy is the energy of sunlight collected and used to provide electricity, to heat water, and to heat or cool homes, businesses or industry.

Sunlight is a clean, renewable source of energy. It is a sustainable resource, meaning it doesn’t run out, but can be maintained because the sun shines almost every day. Coal or gas are not sustainable or renewable: once they are gone, there is none left. More and more people are wanting to use clean, renewable energy such as solar, wind, geothermal steam and others. It is called ‘Green Power’.

http://www.solaronline.com.au/content/solar-energy-facts/

http://www.sciencekids.co.nz/sciencefacts/energy/solarpower.html

http://www.kidcyber.com.au/topics/solar.htm

# Rounding numbers

Rounding Numbers

A rounded number has about the same value as the number you start with, but it is less exact.

For example, 341 rounded to the nearest hundred is 300. That is because 341 is closer in value to 300 than to 400. When rounding off to the nearest dollar, \$1.89 becomes \$2.00, because \$1.89 is closer to \$2.00 than to \$1.00

Rules for Rounding

Here’s the general rule for rounding:

If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up. Example: 38 rounded to the nearest ten is 401
If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down. Example: 33 rounded to the nearest ten is 30
What Are You Rounding to?

When rounding a number, you first need to ask: what are you rounding it to? Numbers can be rounded to the nearest ten, the nearest hundred, the nearest thousand, and so on.

Consider the number 4,827.

4,827 rounded to the nearest ten is 4,830
4,827 rounded to the nearest hundred is 4,800
4,827 rounded to the nearest thousand is 5,000
All the numbers to the right of the place you are rounding to become zeros. Here are some more examples:

34 rounded to the nearest ten is 30
6,809 rounded to the nearest hundred is 6,800
1,951 rounded to the nearest thousand is 2,000

In your maths books round these numbers to the nearest 100
99, 234, 674, 889, 455, 239, 588, 341, 774, 178, 499, 451, 673
Round these numbers to the nearest 1,000
5,999, 3,501, 8,456, 3,555, 9,999, 3,499, 7,245, 4,522, 8,999, 3,567
Round these numbers to the nearest 10,000
56,999, 43,455, 72,899, 23,645, 34,001, 56,767, 98,999, 21,534