9876543210 - 9876543110 = 100
No, not especially. 9876543210 - 123456789 = 9753086421
.0123456789
9876543210
9.63418329 × 1029
1234567890+9876543210=11,111,111,100
00112233445566778899 double the hole thing or 01234567890123456789 twice together
9876741245 Use our brain :|
9876543210 - 9876543110 = 100
1234567890 x 9876543210 = 12193263111263526900
No, not especially. 9876543210 - 123456789 = 9753086421
.0123456789
0123456789
You need to put a minus plus sign before any set of numbers that sums to 23, and a minus sign before all other digits. So + before 6, 8 and 9.
1,646,090,535
9876543210
9.63418329 × 1029