Adding Decimals
4.2 + 3.4
7.6
3.4 - 1.2
2.2
3.4 x 10
34
When you add or subtract decimals. What do you do?
Line up the decimals. ( If it is a whole number the decimal is at the end)
Fill in blank areas with zeros.
It rained 2.8 inches on Tuesday and 0.64 inches on Wednesday. How many inches did it rain all together?
3.44 inches
5.2 + 6.75
11.95
3.75-2.3
1.45
2.4 x 100
240
When yo multiply decimals what do you do?
You do NOT line up the decimals. You multiply the numbers and the count how many places are after the decimal and scoop from the end the other to the left, that many places.
Paige earned $25.75 for doing his chores this weekend. Cody earned $18.95. How much more did Paige earn compared to Cody?
$6.80
The most important thing to remember when you add and subtract decimals is to...
Line em up up up - Line up your decimals.
8.7 - 3.65
5.05
0.75 x 1000
750
The answer to a multiplication problem
Product
Breyton had $72. He bought a video game for $40.95. How much money does he have left?
$31.05
12 + 4.56
16.56
8 - 1.3
6.7
5.2 x 1.3
6.76
5.3906 x 100 =
539.06
Catalina runs 3.45 miles. James runs 1.2 times the distance that Catalina does. How far does James run?
4.14 miles
9.12
7.57 - 2
5.57
1.25 x 3.4
4.25
1.57 x 2.4
3.8768
Place the decimal point in the product and EXPLAIN why you put it there.
2.56 x 1.4 =3584
3.584 because you have 3 places behind your decimal in the problem.