A Million How much is that???

Some examples of real-life ‘millions of things’??

94, 767, 083 This is the number of copies of the Guinness Book of World Records sold from 1955 to 2002 How do we know what this number is? How do we know how to read it? –

Suppose we try to put that number into a chart: 94, 767, 083

This is an example of a ‘place-value chart’ The following patterns help you understand large whole numbers: - From right to left, each group of 3 place values in called a period. - In each period, the digits of a number are read as hundreds(H), tens(T), and ones(O). - Each position represents 10 times as many as the position to its right.

This place-value chart shows a record for the # of items in the world’s largest collection of matchbook covers – 3,159,119 We read this number as: Three million one hundred and fifty-nine thousand one hundred nineteen

We can write this number in three different forms: Standard form: ** Notice we leave a space between the periods when we write a number with 5 or more digits Expanded form: Number-word form: 3 million 159 thousand 119

Any place value chart can be extended to the left to show greater whole numbers. We write : We say: fifty trillion one hundred million

Practice Questions: Handout

Number Forms: Standard Form – the actual number in digits only Expanded Form – the number as the sum of the values of its digits (e.g = ) Number-Word Form– a combination of number and words (e.g. 4 million, 546 thousand, 409)