Number

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The following are numbers: 0 1 2 02.5 12.75 0.5 7e6

Enter these, and other numbers, in simple sentences with the verbs + - * %.

  2 * 12.75
25.5

An important rule is that a number does not start with a dot .

  0.5
0.5
   0.5 + 3
3.5
   .5
+-+-+
|.|5|
+-+-+
   .5 + 3
|syntax error
|        .5+3

Clearly .5 is not the same as 0.5. You don't need to know now what .5 is yet, but it is important to understand that a number does not start with a dot .


The _ (underbar) is infinity and is a number.

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