Isn't a neutral number 0? Since it's neither negative nor positive. So if you multiply 0 by 7, it's 0...
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It is a good thing to remember. Of course, not all, but some basic numbers that appear all the time such as the numbers from 2 to 13 should be remembered as they appear in numerous assignments and tests.
1. 24
2. 56
3. 15
4. 60
Hopefully this helps!
