Decimals Worksheet - Unit 3 Page 5
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38We leave a space after
In expanded form, we write 3.268 579 as:
each group of
3 ones
2 tenths
6 hundredths
8 thousandths
3 digits when the number
has more than
5 ten-thousandths
7 hundred-thousandths
9 millionths
4 decimal places.
3
0.2
0.06
0.008
0.0005
0.000 07
0.000 009
We read this decimal as: three and two hundred sixty-eight thousandths,
five hundred seventy-nine millionths
Small decimals are often used in science. For example:
Sound travels very fast. It would take
A garden snail moves very slowly.
In 1 h, it travels 0.0483 km.
0.0046 min for sound to travel from one
We read this number as:
end of a football field to the other.
four hundred eighty-three
We read this number as:
ten-thousandths
forty-six ten-thousandths
The diameter of a human hair is
0.000 025 m. We read this number as:
twenty-five millionths
Science
A virus is too small to see with the
human eye. So, scientists use the
nanometre (nm) to measure a virus.
1 nm
0.000 000 001 m
The Ebola virus has length 0.000 02 cm,
or 200 nm. As a comparison, the head
of a pin has diameter 0.2 cm.
Use a place-value chart to show each number.
1.
2.3425
0.142 86
0.0007
0.000 298
a)
b)
c)
d)
90
Unit 3 Lesson 1
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