ok so one way is to have brackets they make you do what's in brakets first these are brakets ( ) so thats one way
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800+400=1,002+10
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
Which number replaces the box to make this a true number sentence? 6 × (7 - 3) = (6 × 7) - ( × 3)
it means you have to make it double
To change 7 by 8 to make it a true number sentence, you would need to perform a mathematical operation. One way to do this is by adding 1 to 7, which would make it 8. Therefore, the true number sentence would be 8 = 8.