.

1. Decimals – Addition
and Subtraction and
Subtraction

2.  The position of a digit in a number shows its
“Place Value”

3.  Remember: Numbers to the right have (ths) at
the end, and numbers to the left have (s) at the
end.

4.  Lets name a few….
 What is the place
value of 6.04?
 What is the place
value of 28?
 What is the place
value of 1,769?
 Ones place
 Tens place
 Hundreds place

5.  Lets name a few….
 What is the place value
of 32,451?
 What is the place value
of 5,925,362?
 What is the place value
of 1,783,514?
 Ten thousands place
 One millions place
 One hundred thousands

6.  Now lets go to the other
side of the decimal…
 What is the place value
of 1.03?
 What is the place value
of 14.629?
 What is the place value
of 293.857?
 Hundredths place
 Tenths place
 Thousandths place

7.  Now lets go to the other
side of the decimal…
 What is the place value
of 0.1456?
 What is the place value
of 3.682157?
 What is the place value
of 1.032587469?
 Ten thousandths
 Millionths place
 Hundred thousandths
place

8.  When you add decimals together make sure to
line them up!
 31.007 + 0.019
31.007
0.019
31.026
 Remember to add from the right!

9.  You try a few…
 28.032 + 0.234 =
 0.89 + 1.53 + 25.902 =
 43.079 + 0.372 + 0.0003 +25 =
 0.250 + 0.398 + .825 +.0125 =
 28.266
 28.322
 68.4513
 1.4855

10.  Remember:

1
10
= 0.1
1
100
= 0.01
1
1000
= 0.001
 Write the answers as decimal numbers:

7
100
+
2
100
= 0.09
 Let’s try a few…..

11. 
11
100
+
21
100
=

254
1000
+
31
100
=

45
100
+
13
100
=

8
100
+
5
10
=

12
1000
+
3
10
=

103
1000
+
7
10
=
31
100
654
1000
58
100
58
100
312
1000
803
1000

12.  Scooter Quest finding the place value
http://www.sheppardsoftware.com/mathgam
es/decimals/scooterQuestDecimal.htm