Subtraction means to take away. So any number that you need to know, you take away the other number. Like this....5 take away 2 equals 3. Use your fingers and see. Five fingers take away two fingers leaves three fingers. Got it? Now try it with the symbols. 5-2=3. It's just the opposite of addition. You take away the number rather than add it.
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No you can not use subtraction or division in the associative property.
To find the sum of integers, you use addition.To find the difference, you use subtraction.
because you undo the operation in the equation= to undo subtraction you add
6781 - 1 = 6780
Nope. Its not possible