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Transcript of NUMBER
Where in real life can we find numbers?
This table shows the number seventeen thousand
WORKING WITH NUMBERS
The value of each digit in a number depends on its position in the number, its place value.
Integer is a whole number.
READING AND WRITING NUMBERS
WORKING WITH WHOLE NUMBERS
Rounded numbers can be used for estimation and checking. Numbers can be rounded to the nearest 10, 100, 1000, 10 000, etc. depending on the size of the number and the level of accuracy needed.
To round number:
if the digit in the column to the right is 0, 1, 2, 3, 4 round down
if the digit in the column to the right is 5, 6, 7, 8, 9 round up
to the nearest 10, the number will end in 0;
to the nearest 100, the number will end 00;
to the nearest 1000 the number will end 000 etc.
CALCULATING WITH WHOLE NUMBERS
To solve the problem:
Make sure you understand the question. Underline important information.
Decide which numbers you need and whether you need to add, subtract, multiply or divide.
Check your answers.
HOW TO CHECK YOUR CALCULATIONS
A travel agent is paid £29 820 a year. How much is this a month?
29 820/12 = £2 485
30 000/10 = 3 000, so the correct answer is the right size.
Reverse calculation check:
2485 x 12 = £29 820
On your booklet write:
1. What worked well (WWW)
2. Even better if (EBI)
reading and writing numbers - place value
calculating with whole numbers
1. A large company announces annual profits of £23 billion. Write the number 23 billion in figures.
2. Our galaxy contains roughly 250,000,000,000 stars. How many billion is this?
3. One of the largest lotto wins was £22,590,829. Round this amount to the nearest £100 000.
4. In 2005–2006 the average attendance at a premiership football match was 34 000 to the nearest 1000. What was the smallest possible average attendance?
5. A population of 3.5 million bacteria increases by 488 000. How many bacteria are there now?
1. National minimum wage in the UK is nine thousand four hundred and forty pounds per year. Write the number in figures
2. Our galaxy contains roughly 1,673 meteors. How many hundreds is this?
3. New IPhone 4S costs £549. Round this to the nearest £100.
4. On Monday, the average number of people who had lunch in canteen was 450 to the nearest 10. What was the smallest possible number of people?
5. A population of 3.5 thousand bacteria increases by 488. How many bacteria are there now?
LEVEL 1 - 2
4. 33 500
LEVEL 1 - 2
Place the value of 7 in these numbers:
To help you to remember watch this video:
Work on number booklet.
FACTORS AND MULTIPLES
of a number is found by multiplying the number by any whole number.
For example: multiples of 4 are 4, 8, 12, 16, 20, 24....
is a whole number that divides exactly into a given number. Factors come in pairs.
For example, what are the factors of 30?
1 and 30 (because 1x30=30)
2 and 15
3 and 10
5 and 6