add on 100 and deduct 1
12,346,578,910 + 100 = 12,346,579,010
12,346,579,010 - 1 = 12,346,579,009
or if 12,345,678,910 was meant in question
(with 5 and 6 swapped round)
then answer is 12,345,679,009
12.99 + 99 + 99 + 99 = 309.99
199 + 199 + 199 + 199 + 99 + 99 + 99 = 1192
307
297
99 + 99 + 88 + 88 + 72 + 72 = 518
99 + 99 = 198
330 plus 99 plus 7 is equal to 436.
99 plus 99 equal 198.In a nother form (This is in when it is used in math class ECT.)99+99=198.
99
69 plus 54 plus 99 plus 62 plus 69 plus 62 plus 34 plus 59 plus 74 plus 99 plus 78 equals 759
((10.00 - 1.50) plus 99) plus 1.10 = 108.6
99 + 98 + 97 = 294