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.
Thatâ€™s it for now......
For more help with your maths, try
my book:
mastering multiplication tables
on amazon.com
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