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To increase the value of a number to the next highest whole number, you can round up the number. To do this, you look at the decimal part of the number. If it is greater than or equal to 0.5, you add 1 to the whole number. If it is less than 0.5, you simply keep the whole number as is.
For example:
If you want to increase the value of 2.3 to the next highest whole number, you look at the decimal part (0.3) and see that it is less than 0.5. Therefore, you keep the whole number (2) and the answer is 2.
If you want to increase the value of 5.8 to the next highest whole number, you look at the decimal part (0.8) and see that it is greater than or equal to 0.5. Therefore, you add 1 to the whole number (5) and the answer is 6.