# Lesson: Subtract Whole Numbers (Lesson 2)

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### Lesson Objective

Subtract whole numbers with and without regrouping.

### Lesson Plan

Do Now:

Count backwards (orally) by ones from ten, by threes from 30, by tens from 100.

Opening:

Tell students that they did a great job counting backwards.  Tell them that if they can count backwards, they can subtract.

Direct Instruction:

• State objective.
• Review subtracting without regrouping.
• Explicitly tell students that when the top number is bigger than the bottom number in each column, you do not have to regroup.
• Model subtracting with regrouping.

Guided Practice:

Subtract the following:

1.  56-39
2.  984-606
3. 1,234-999

First, set each problem up vertically by "stacking"  numbers into their appropriate column.  Then,  ask will you need to borrow?  If yes, ask in which place.

Independent Practice:

879-88
2,875-798
36,829-970

Closing:

Exit Questions: In the problem 3,452-128, do you need to borrow?  Explain and then find the difference.

### Lesson Resources

 Subtracting Whole Numbers Lesson 2 Quiz 1    Other 812