Objective: Add and subtract decimals.
Activate Prior Knowledge:
Add or Subtract.
- 2526 +460 =
- 4389 - 238 =
- 43026 + 3507 =
- 7506 - 3308 =
New Knowledge:
To add or subtract decimals align the decimal point first, then place each number according to place value; use zeros as place holders when needed.
Add or subtract make sure to include the decimal point in the answer.
Decimal point goes under decimal point.
Examples:
- 3.45 + 7 + 0.825 =
- 51.4 - 65.25 =
Application: p.68 (13-28)
Homework: Practice Workbook p.15(1-8)
Reflection: It is important to align the decima point before we add or subtract because...
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