To round a decimal number to the nearest whole number, look at the digit in the tenths column. If the tenths digit is 0-4, round down. If it is 5-9, round up. However, if rounding up results in the units digit becoming a 9 (e.g. 9.57), round up to the next multiple of ten instead of just the units place (e.g. rounding 9.57 up to 10 instead of 9).

1. How to round a decimal number
to the nearest whole number
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2. First look at the value of the digit in
the tenths column
4.7
Has 7 tenths

3. First look at the value of the digit in
the tenths column
4.7
Has 7 tenths
5.58
Has 5 tenths

4. First look at the value of the digit in
the tenths column
4.7
Has 7 tenths
5.58
Has 5 tenths
3.276
Has 2 tenths

5. First look at the value of the digit in
the tenths column
4.7
Has 7 tenths
5.58
Has 5 tenths
3.276
Has 2 tenths
4.3
Has 3 tenths

6. You round down to the nearest whole
number if the tenths digit is 0,1,2,3 or 4.
3.2 is rounded down to 3

7. You round down to the nearest whole
number if the tenths digit is 0,1,2,3 or 4.
3.2 is rounded down to 3
4.32 is rounded down to 4

8. You round down to the nearest whole
number if the tenths digit is 0,1,2,3 or 4.
3.2 is rounded down to 3
4.32 is rounded down to 4
17.158 is rounded down to 17

9. You round down to the nearest whole
number if the tenths digit is 0,1,2,3 or 4.
3.2 is rounded down to 3
4.32 is rounded down to 4
17.158 is rounded down to 17
120.06 is rounded down to 120

10. You round down to the nearest whole
number if the tenths digit is 0,1,2,3 or 4.
3.2 is rounded down to 3
4.32 is rounded down to 4
17.158 is rounded down to 17
120.06 is rounded down to 120
45.4 is rounded down to 45

11. You round up to the nearest whole
number if the tenths digit is 5,6,7,8 or 9.
4.7 is rounded up to 5

12. You round up to the nearest whole
number if the tenths digit is 5,6,7,8 or 9.
4.7 is rounded up to 5
5.58 is rounded up to 6

13. You round up to the nearest whole
number if the tenths digit is 5,6,7,8 or 9.
4.7 is rounded up to 5
5.58 is rounded up to 6
17.872 is rounded up to 18

14. You round up to the nearest whole
number if the tenths digit is 5,6,7,8 or 9.
4.7 is rounded up to 5
5.58 is rounded up to 6
17.872 is rounded up to 18
125.92 is rounded up to 126

15. You round up to the nearest whole
number if the tenths digit is 5,6,7,8 or 9.
4.7 is rounded up to 5
5.58 is rounded up to 6
17.872 is rounded up to 18
125.92 is rounded up to 126
46.6 is rounded up to 47

16. Watch out for numbers which have 9
in the units column.
e.g. 9.57
If you are rounding up, you will make 10 units.
This makes 1 ten, so you have to round to the
next ten (in this case to 10).

17. Watch out for numbers which have 9
in the units column.
e.g. 9.57
If you are rounding up, you will make 10 units.
This makes 1 ten, so you have to round to the
next ten (in this case to 10).
For the same reason, 29.87 becomes 30

18. Watch out for numbers which have 9
in the units column.
e.g. 9.57
If you are rounding up, you will make 10 units.
This makes 1 ten, so you have to round to the
next ten (in this case to 10).
For the same reason, 29.87 becomes 30
19.75 becomes 20

19. Watch out for numbers which have 9
in the units column.
e.g. 9.57
If you are rounding up, you will make 10 units.
This makes 1 ten, so you have to round to the
next ten (in this case to 10).
For the same reason, 29.87 becomes 30
19.75 becomes 20
And 459.68 becomes 460

20. That’s it for now......
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