The 4.
12345 + 6789 = 19134
All of them.
Six - assuming 0123 does not count ... 1234 2345 3456 4567 5678 6789
2345 x 6789 = 15920205
It is the same as 6789 x 102 which would be equal to 692478.
12345 + 6789 = 19134
12345+6789=19134
12345 by 6789 ft squared
All of them.
It is already a four-digit number.
6789
6789
6,789 to the nearest tens place = 6,790
Six - assuming 0123 does not count ... 1234 2345 3456 4567 5678 6789
6789/1
6789/1
4 options for the first digit, 3 options for the second digit, 2 options for the third digit. Multiply the number of options together, and you find how many 3-digit numbers you can get.