Understanding Decimal Addition and Subtraction
Decimals are just like whole numbers, but with a special dot to show parts of a whole!
When adding or subtracting decimals, the most important rule is to line up the decimal points. This keeps all the place values (tenths, hundredths, etc.) in the correct columns. You can add zeros at the end to make the numbers the same length if needed!
Step-by-Step Guide
1️⃣ Write the numbers vertically with decimal points lined up
2️⃣ Add zeros if needed to make all numbers the same length
3️⃣ Add or subtract just like with whole numbers
4️⃣ Bring down the decimal point directly below the others
Let's Practice Together!
Example 1: Adding Decimals
Solve: 3.75 + 2.4
3
.
7
5
0
+
2
.
4
0
0
Example 2: Subtracting Decimals
Solve: 5.3 - 1.78
5
.
3
0
-
1
.
7
8
Parent Tips 🌟
- Money makes it real: Use dollar amounts to practice adding and subtracting decimals. Have your child calculate change from purchases or compare prices.
- Visual alignment matters: Use graph paper to help your child keep the decimal points lined up when writing problems vertically.
- Daily practice: Incorporate quick decimal problems into everyday activities like measuring ingredients or tracking sports statistics.