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“Don’t make me read, make me understand “
www.makemegenius.com– Full of ingredients to make your child a genius.
Copyright of www.makemegenius.com, for more videos ,visit us.
Decimals
(Concepts & Computation)
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Number Sense
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Whole number; number of people attending an event (305)
Decimal; number of gallons of gasoline (3.65)
Ratio; number of men compared to number of women (2:5)
Fraction; measurement of diameter (¾)
Percent; discount rate, interest rate (14.5%)
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Decimals and Place Value
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A decimal is a number with a decimal point in it (6.52, 0.5, 0.01)
The value of digits in a decimal is based on the number 10
The digits to the left of the decimal point represent whole number
The numbers to the right of the decimal point represent some part
of 1
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Exercise
• In what place is the underlined digit?
4.068
64.183
4.106
5.832
5.134
• What number does the underlined name?
5.839 24.935 328.407 840.019 247.893
• Circle the number in which the 3 has the greater value.
73.249
78.329
856.634 1,420.038
865.463 1,240.308
52.243
49.321
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Thousandths
• 2 1 6 4. 5 7 8
– 2; thousands
– 1; hundreds
– 6; tens
– 4; ones
– 5; tenths
– 7; hundredths
– 8; thousandths
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Exercise
• Write the decimals.
609
• -----• 1000
•
89
4 ----1000
3
5
86 ----- --1000 10
125
2 ----1000
• Fifty-two thousandths
• Four and four thousandths
• Eight thousandths
• One hundred fifty-nine and twelve hundredths
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Comparing and
Ordering Decimals
• Compare the decimals 0.27 and 0.25
– Compare number of ones (0 = 0)
– Compare number of tenths (2 = 2)
– Compare number of hundredths (7 > 5)
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Exercise
• Write <, =, or >.
0.45 0.045
0.9 0.09
0.66 0.6
0.25 0.250
0.07 0.70
0.503 0.53
0.31 0.310
0.6 0.600
0.129 0.12
• Write in order from the least to the greatest
4.4 ; 4.7 ; 4.38
0.63 ; 0.6 ; 0.3
5.01 ; 4.98 ; 5
17.182 ; 1.728 ; 17.218
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Changing Fraction to Decimal
• You can change a fraction to a decimal by dividing the numerator by
the denominator
• Numerator; the top part of a fraction
• Denominator; the bottom part of a fraction
• When you divide until the remainder is zero, the decimal is a
terminating decimal
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Exercise
• Change each fraction to a decimal.
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18
--25
3
--40
9
--8
7
--32
9
--20
• Write each decimal as a mixed number or fraction in
simplest form
• 0.65 0.225
0.006
1.4
0.625
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Thanks
Submitted by
Anish
DAV Public School
Noida
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“Don’t make me read, make me understand “
www.makemegenius.com– Full of ingredients to make your child a genius.
Copyright of www.makemegenius.com, for more videos ,visit us.