Decimals : Addition & Subtraction
1. Addition of Decimals Using Column Method
Rule:
👉 Line up the decimal points carefully, so each digit is in the correct column (ones under ones, tenths under tenths, etc.).
👉 Add from right to left, just like with whole numbers.
👉 If the columns don’t line up neatly (different numbers of digits), add zeros to fill in the gaps.
✏️ Example 1) 9.36 + 7.23 = ?
✏️ Example 2) 49.365 + 7.2 = ?
2. Subtraction of Decimals Using Column Method
Rule:
👉 Line up the decimal points carefully.
👉 Subtract from right to left, borrowing if needed.
👉 Add zeros if the numbers don’t have the same number of digits after the decimal point.
✏️ Example 1) 6.54 − 2.41 = ?
✏️ Example 2) 54.132 − 6.8 =?
3. Special Case: When the second number has more decimal places
✏️ Example) 7.4 − 2.465 = ?
Step-by-step:
1)First, line up decimal points.
2) Add zeros so they have the same number of digits after the decimal
3) Now subtract:
