Transcript Rounding 10 100 1000 15JUN

Starter Questions
1. 456 x 6
2. 8865  9
3. Write the place value headings above
the number and write down the value
of the underlined number
2 5 3 9
4. Calculate the value of the
missing angle.
47º
Whole Numbers
Learning Intention
To round numbers to the nearest
10, 100 and 1000.
Whole Numbers
We do not always need to know the exact value of a number.
For example,
There are 1432
pupils at Eastpark
Secondary School.
There are about one
and a half thousand
pupils at Eastpark
Secondary School.
Whole Numbers
Whole Numbers
Rounding to nearest 10, 100 and 1000
“If It’s 5 or above give it a shove
If it’s 4 or below keep it low”
To round to the nearest 10 : look at the units digit:
- If it is a 0, 1, 2, 3, 4
leave the 10’s digit as it is.
- If it is a 5, 6, 7, 8, 9
round the 10’s digit up by 1.
To round to the nearest 100 : look at the tens digit:
- If it is a 0, 1, 2, 3, 4
leave the 100’s digit as it is.
- If it is a 5, 6, 7, 8, 9
round the 100’s digit up by 1.
Whole Numbers
Rounding to nearest 10, 100 and 1000
To round to the nearest 1000 : look at the hundreds digit:
- If it is a 0, 1, 2, 3, 4
leave the 1000’s digit as it is.
- If it is a 5, 6, 7, 8, 9
round the 1000’s digit up by 1.
Whole Numbers
Example
Round 34 871 to the nearest 100.
Look at the digit in the hundreds position.
We need to write down every digit up to this.
Look at the digit in the tens position.
If this digit is 5 or more then we need to round up the
digit in the hundreds position.
Solution:
34871 = 34900 (to the nearest 100)
Whole Numbers
Complete this table:
to the nearest
1000
to the nearest
100
to the nearest
10
37521
38000
37500
37520
274503
275000
274500
274500
7630918
7631000
7630900
7630920
10000
9900
9880
0
500
450
9875
452
Whole Numbers
Rounding to nearest 10, 100 and 1000
Now try Ex 5.1
Ch1 Pg 9