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An equation is a mathematical statement, in symbols, that
two things are the same (or equivalent). Equations are written
with an equal sign, as in   
 2 + 3 = 5

An inequality is a statement about the relative size or order of
two objects. Could be
greater than or less than
Example:  4 x 4 < 20

This
inequality says 4 times 4 is less than < 20


Equation and inequality are number sentence
Example: 2 + 3 = 5       4 x 4 < 20    These are all number
sentence.  

Some number sentence will ask you to find missing
numbers
12 + ? > 30  what is the missing number

A. 13        B. 15           C. 20
the missing number in this number sentence is -
c. 20

Number sentence can be true or not true
Example: 4 + 6 = 8   This number sentence is not true,
because 4 plus 6  equal  10 not 8

Number sentence can be greater than or less than
< (less than sign)                 > (greater than sign)


other operation symbols in number sentence
not equal to
is greater than or equal to
is less than or equal to



Typical number sentence homework.
If John has three apples. He gives two apples to Jane. Write
a number sentence for this problem. Answer: 3 - 2 = 1

Jenny has 7 marbles and Kenny has 5.  How many do they
have together? Write a number sentence for this problem.
Answer:  7 + 5 = 12

What number is missing to make this number sentence true
237 < 2 __ 8
A O       C2        D3         B1

Answer is
D3   238
Number Sentence
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