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Decimal numbers
Adding and Subtracting Decimals
Adding and Subtracting Decimal Numbers
2.59 + 3.1 4.75 - 3.212
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Slide 1:
Diapositive
Mathematics
6th Grade
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Adding and Subtracting Decimals
Adding and Subtracting Decimal Numbers
2.59 + 3.1 4.75 - 3.212
Slide 1 - Diapositive
Remember, decimals are another form of fractions
0.1 = one tenth
0.21 = twenty-one hundredths
0.8005 = eight thousand, five ten-thousandths
1.5 = one and five tenths
5.099 = five and ninety-nine thousandths
6.985 = six and nine hundred eighty-five thousandths
Slide 2 - Diapositive
Remember that adding zeros to the right of a decimal number does not change its value.
5.3 = 5.300
1.9 = 1.90
0.05 = 0.050
Slide 3 - Diapositive
Any regular number can be written as a decimal number.
Just add a decimal point and zeros to the right!
5 = 5.0 =5.000
250 = 250.00 = 250.0000000000000000000000000000
Slide 4 - Diapositive
Five and five-tenths
Nine-hundredths
0.09
0.090
5.50
5.500
0.050
0.0050
55.0
0.9
0.900
1.090
Slide 5 - Question de remorquage
To add decimal numbers...
1) line up the decimal points
2) fill spaces on the right side
with zeros
3) add
Don't forget to carry when you need to!
55.9 + 41.339
55.9
+ 41.339
55.900
+ 41.339
97.239
Slide 6 - Diapositive
To subtract decimal numbers...
1) line up the decimal points
2) fill spaces on the right side with zeros
3) subtract.
Don't forget to borrow when you need to!
48.95 - 7.2581
48.95
- 7.2581
48.9500
- 7.2581
41.6919
Slide 7 - Diapositive
What if a number doesn't have a decimal point?
Add a decimal point and zeros to the right before adding or subtracting.
52 - 4.899
52
- 4.899
52.000
-4.899
Slide 8 - Diapositive
What steps do we do before adding or subtracting decimal numbers?
Slide 9 - Question ouverte
Drag each problem to the step that needs to be done next
1. Line up decimal points
2. Add zeros to fill spaces
on the right side
3. Add or subtract!
5.99
+1.03
45.99
- 1.1
55.099
-1.06
598.2
+9.0599
Slide 10 - Question de remorquage
59.23 - 13.99
A
4524
B
45.24
C
46.34
D
Cannot be subtracted
Slide 11 - Quiz
510.05 + 2.995
Slide 12 - Question ouverte
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