77
- = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( )
% < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9
( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8
9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7
8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6
7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5
6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3
What are decimals?
All numbers are made up of digits: 0, 1, 2, 3, 4, 5, 6, 7, 8 and
- = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( )
- Digits are like letters in a word. A word is made up of letters.
Numbers are made up of digits: 23 is a two-digit number, made
from the digits 2 and 3; 627 is a three-digit number made from
the digits 6, 2 and 7. Th e position of the digit in the number tells
us its value. For instance, the 2 in the number 23 has a value of 2
tens, and the 3 has a value of 3 ones. Numbers in the hundreds
are three-digit numbers: 435, for example. Th e 4 is the hundreds
digit and tells us there are 4 hundreds (400). Th e tens digit is 3
and signifi es 3 tens (30). Th e units digit is 5 and signifi es 5 ones,
or simply 5.
When we write a number, the position of each digit is important.
Th e position of a digit gives that digit its place value.
When we write prices, or numbers representing money, we use a
decimal point to separate the dollars from the cents. For example,
CChapter 9hapter 9
MULTIPLYING MULTIPLYING
DDECIMALSECIMALS