Unit 3: Adding Decimals
To add decimals, first line up the decimal points and then add. This might mean that a problem presented in a horizontal pattern needs to be rewritten in a vertical pattern.
A whole number always has a decimal point to the right side of the final number: 56 = 56.0
3.42 + 0.13 = ? ---> 3.42
+ 0.13
3.55
46 + 1.85 = ____ ---> 46.00 <--- Place a decimal point and fill the empty spaces with zeroes.
+ 01.85
47.85
Lining up the decimals is the first step in ensuring the correct answer for the addition of decimals.
2.36 + 0.007 + 1.4 = _____ ---> 2.360 Fill the empty spaces with zeros.
0.007
+ 1.400
3.767
Step 1: Line up the decimals. The order of the numbers to be added is not important.
Step 2: Add the numbers and bring the decimal point straight down.
Complete the following practice problems:
1. 0.9 + 36 +1.25 =
2. 15.2 + 17.071 + 0.74 =
3. 0.11 + 86 + 0.125 =
4. 10.79 + 0.99 + 0.25 =
5. 0.0096 + 50.24 + 39 =
6. 0.849 + 1.6 + 56.3 =
7. 14.28 + 16.24 + 97
8. 0.75 + 23.87 + 124.07
9. A 25-year-old patient receives the following medication dosages daily: 1.5 milligrams, 2.25 milligrams and 0.75 milligrams. What is his total dosage?
10. A child weighs 15.9 kilograms. The child has gained 0.9 and 1.5 kilograms during the past two months. What is the child's current weight in kilograms?
11. Patient Smith receives 4 tablets of medication dosages daily: one tablet is 225 milligrams, two tablets are 0.125 milligrams each and one tablet is 0.75 milligrams. What is the patient's total daily dosage of medication in milligrams?
12. One tablet is labeled 124 milligrams and another is labeled 0.5 milligrams. What is the dosage of these two tablets?
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