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THE USE OF SYMBOLS
CONTENT
- Open Sentences
- Letters to Represent Symbols or the Unknown
- Open Sentences with Two Unknowns
Open Sentences
Consider the question:
“What number added to \(7\) will give you \(12\) ?” How will you write that as a mathematical sentence?
A mathematical sentence consists of numbers and symbols (that represent unknown numbers) called variables. The equivalent mathematical sentence of the above question can be written as:
\(\text{ }+ 7 = 12\)
We call the above equation an open sentence.
Example:
\(14 +\text{ }\) \(= 17\)
This will be true if \(3\) goes in the box.
\(14 +\text{ }\) \(3\) \(= 17\)
We say \(14 +\text{ }\) \(= 17\) is an open sentence. Any value can go in the box but usually, only one value will make an open sentence true.
CLASS ACTIVITY
In each sentence, find the number which makes it true.
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