You could just do your 10 times table and add 5 on to it.
Look here is an EG
15 X 2 = 30
10 + 10 = 20
5+5=10
add them to together it made 30.
That way is easy for people that cant do times tables.
That should of told you how to do most times tables.
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For 15:0 * 15 = 01 * 15 = 152 * 15 = 303 * 15 = 454 * 15 = 605 * 15 = 756 * 15 = 907 * 15 = 1058 * 15 = 1209 * 15 = 13510 * 15 = 15011 * 15 = 16512 * 15 = 18013 * 15 = 19514 * 15 = 21015 * 15 = 22516 * 15 = 24017 * 15 = 25518 * 15 = 27019 * 15 = 28520 * 15 = 30021 * 15 = 31522 * 15 = 33023 * 15 = 34524 * 15 = 36025 * 15 = 37526 * 15 = 39027 * 15 = 40528 * 15 = 42029 * 15 = 43530 * 15 = 450For 25:0 * 15 = 01 * 15 = 252 * 15 = 503 * 15 = 754 * 15 = 1005 * 15 = 1256 * 15 = 1507 * 15 = 1758 * 15 = 2009 * 15 = 22510 * 15 = 25011 * 15 = 27512 * 15 = 30013 * 15 = 32514 * 15 = 35015 * 15 = 37516 * 15 = 40017 * 15 = 42518 * 15 = 45019 * 15 = 47520 * 15 = 50021 * 15 = 52522 * 15 = 55023 * 15 = 57524 * 15 = 60025 * 15 = 62526 * 15 = 65027 * 15 = 67528 * 15 = 70029 * 15 = 72530 * 25 = 750
152= 15*15 = 225 152= 15*15 = 225 152= 15*15 = 225 152= 15*15 = 225
15 x 6 = 90 Another way to look at is 15 + 15 + 15 + 15 + 15 + 15.
the additive inverse of (-15) is 15.
The opposite of -15 is 15 .