1 times 2 and 2 times 1 equal the same thing because of the commutative property of multiplication. This property states that changing the order of the factors does not change the product. Therefore, both calculations yield the same result: 2.
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Multiplying by one (1) is the Identity Property in Multiplication. You always get the same number as the answer. It does not matter how many times you multiply by 1. The answer is 1
1 times -35 equals -35
-1 times 168 equals -168
These are the result of the fundamental laws of multiplication. In the real number system (and beyond), one is the identity of multiplication and that menas that 1*a = a*1 = a for all numbers a.
When you subtract a negative number, that is the same thing as adding a positive number, so this equals 10.