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it is not a number sentence because number sentences have to have an answer to make 7x8 a number sentence it has to be 7x8=56
A number sentence is a mathematical equation, such as 2x6+5x4=32.
2 numbers that make 10
a number sentence contains an equal sign
A number sentence has a letter as its solution while a number model has the solution. I remember this by thinking of a number model as a model of what the full equation should be and a number sentence being the opposite of that.