Transcript Slide 1 - Math In Mind

Rounding Off Decimals
Round off 37 to the nearest ten
0
10
20
30
40
50
60
70
80
37 is between 30 and 40
90
100
Rounding Off Decimals
Round off 37 to the nearest ten
30
31
32
33
34
35
36
37
37
38
39
Where are the nearest tens?
37 is nearer to 40 than to 30
37 is 40
? when rounded off to
the nearest ten
40
Rounding Off Decimals
Round off 750 to the nearest hundred
500
600
700
800
900
750 is between 700 and 800
1000
Rounding Off Decimals
Round off 750 to the nearest hundred
700
720
740 750 760
780
800
Where are the nearest hundreds?
750 is halfway
halfway between 700 and 800
750 is 800
? when rounded off
to the nearest hundred
Rounding Off Decimals
Round off 1.4 to the nearest whole number
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
Where
the nearest
whole
1.4 isare
nearer
to 1 than
to 2numbers?
1.4 is 1? when rounded off to
the nearest whole number
2
Rounding Off Decimals
Round off 3.7 to the nearest whole number
3
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
Where
the nearest
whole
3.7 isare
nearer
to 4 than
to 3numbers?
3.7 is 4
? when rounded off to
the nearest whole number
4
Rounding Off Decimals
Round off 3.5 to the nearest whole number
3
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
Where
the nearest
whole
3.5 isare
halfway
between
3 numbers?
and 4.
3.5 is 4
? when rounded off to
the nearest whole number
4
Rounding Off Decimals
Round off 5.764 to the nearest whole number
5
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.764
Where
nearest
5.764are
is the
nearer
to 6whole
than numbers?
to 5
5.764 is 6
? when rounded off to
the nearest whole number
6
Rounding Off Decimals
4.8

5
5 liter when rounded off to the
4.8 liter is ______
nearest liter.
7.259

7
7 kg when rounded off to the
7.259 kg is _____
nearest kilogram.
8.49

8
8
8.49 m is ______ m when rounded off to the
nearest meter.
Rounding Off Decimals
Rounding Off Decimals
What is the first
hundredth?
This is a
hundredth.
So it is between
two tenths.
Round off 4.56 to the nearest tenth
4.5
4.51 4.52
4.53 4.54
4.55 4.56
4.57 4.58
4.59 4.6
Between two tenths there are 10 hundredths
What are the nearest two tenths?
4.56 is nearer to 4.6 than to 4.5
4.56 is 4.6
? when rounded off to
the nearest tenth
Rounding Off Decimals
What is the first
hundredth?
This is a
hundredth.
So it is between
two tenths.
Round off 7.62 to the nearest tenth
7.6
7.61 7.62
7.63 7.64
7.65 7.66
7.67 7.68
7.69 7.7
Between two tenths there are 10 hundredths
What are the nearest two tenths?
7.62 is nearer to 7.6 than to 7.7
7.62 is 7.6
? when rounded off to
the nearest tenth
Rounding Off Decimals
This is a
hundredth.
Round off 4.55 to the nearest tenth
4.5
4.51 4.52
4.53 4.54
4.55 4.56
4.57 4.58
4.59 4.6
Rounding off to the nearest tenth is the
same
as rounding
to 1 decimal
place.
Where
are theoffnearest
tenths?
4.55 is halfway between 4.5 and 4.6
4.55 is 4.6
? when rounded off to
the nearest tenth
Rounding Off Decimals
4.56  4.6
4.72  4.7
4.85  4.9
If the digit is equal to 5 or
more than 5, add 1 to the
digit in the tenths place.
If the digit is less than 5,
retain the digit in the
tenths place.
When rounding off to 1 decimal place, consider
the digit in the hundredths place only.
This is a
Rounding Off Decimals
What is the first
thousandth.
thousandth?
So it is between two
hundredths.
Round off 4.518 to the nearest hundredth
4.51 4.511 4.512 4.513 4.514 4.515 4.516 4.517 4.518 4.519 4.52
Between two hundredths there are 10 thousandths
What are the nearest two hundredths?
4.518 is nearer to 4.52 than to 4.51
4.518 is 4.52
? when rounded off
to the nearest hundredth
This is a
Rounding Off Decimals
What is the first
thousandth.
thousandth?
So it is between two
hundredths.
Round off 8.364 to the nearest hundredth
8.36 8.361 8.362 8.363 8.364 8.365 8.366 8.367 8.368 8.369 8.37
Between two hundredths there are 10 thousandths
What are the nearest two hundredths?
8.364 is nearer to 8.36 than to 8.37
8.364 is 8.36
?
when rounded off
to the nearest hundredth
Rounding Off Decimals
This is a
thousandth.
Round off 4.515 to the nearest hundredth
4.51 4.511 4.512 4.513 4.514 4.515 4.516 4.517 4.518 4.519 4.52
Rounding off to the nearest hundredth is the
Where
the nearest
hundredths?
same as are
rounding
off to 2 decimal
places.
4.515 is halfway between 4.51 and 4.52
4.515 is 4.52
?
when rounded off
to the nearest hundredth
Rounding Off Decimals
4.528  4.53
4.564  4.56
4.515  4.52
If the digit is equal to 5 or
more than 5, add 1 to the
digit in the hundredths
place.
If the digit is less than 5,
retain the digit in the
hundredths place.
When rounding to 2 decimal places, consider the
digit in the thousandths place only.
Rounding Off Decimals
Decimal
Rounded off to the nearest
Whole
number
tenth
hundredth
2.039
2
2.0
2.04
6.615
7
6.6
6.62
7.188
7
7.2
7.19