Addition
0.95 + 5.09 =
6.04
5.68 - 4.23 =
1.45
8 x 6.5 =
52
5.6 X 10
56
For which 2 operations (addition, subtraction, multiplication) do you need to line up the decimal points?
Addition and Subtraction
11.27 + 9.4 =
20.67
67.75 - 8.1 =
59.65
4.2 x 1.8 =
7.56
2.45 X 100
245
For which operation (addition, subtraction, multiplication, division) do you need to count the total decimal places of the factors, in order to correctly place the decimal point in the answer?
Multiplication
9.6 + 0.18 =
9.78
43.03 - 6.912 =
36.118
3.7 x 0.8 =
2.96
156 X .01
1.56
What are the two methods our class uses to place the decimal for multiplication answers?
Estimation
Counting decimals/hops
1.23 + 8 + .005
9.235
12 - 4.61 - 2.35 =
5.04
0.07 x 0.4
0.028
23.1 X 5.7
131.67
When multiplying by .1, .01, .001 etc. which way does the decimal point go, to the right or to the left?
To the left
8 + 2.45 + 3.026
13.476
100 - 4.25 =
95.75
.23 x 0.001
0.00023
5.11 X 3.7
18.907
When multiplying by a 100, how many places and which way do you move the decimal point?
Right two