Mental Division Lesson Plan for 4th Grade

Learning objective

• Recall division facts for all divisors from 1 through 10
• Apply fast recall to complete division fact exercises fluently
• Build automatic division fluency across all tables up to 10

Materials

• Division facts (missing dividend or divisor)
• Divide by whole tens or hundreds
• Divide whole tens or hundreds by 1-digit
• Single digit division (no remainder)
• Remainder, divisor a whole ten
• Remainder, divisor a whole hundred
• Pencils, and whiteboard space for the modeled examples

Lesson steps

1. 1. Warm up together (5 min)

   Open with three quick mental problems on mental division, hands down, answers called out together. You are checking who has recall and who is reconstructing every time.

2. 2. Model it (I do) (10 min)

   Solve two mental division problems on the board, narrating the step most students skip. Then solve one wrong and ask the class to find where it broke.

3. 3. Practice together (we do) (10 min)

   Work three more problems as a class. Ask a different student to supply each step rather than the whole answer. If a step stalls, drop back to concrete objects or a drawing before moving on.

4. 4. Independent practice (you do) (15 min)

   Hand out "Division facts (missing dividend or divisor)". Students work independently while you circulate. Note who is fluent, who is counting on fingers, and who has not started, because that grouping drives tomorrow's small group.

5. 5. Close the loop (5 min)

   Pull the class back. Ask one student to explain a problem they got right and one to name something that is still confusing. End on the confusion, not the success, so students learn that naming a gap is normal.

Check for understanding

Collect the practice pages and sort them into three piles: fluent, developing, and not yet. Any student in the third pile needs mental division retaught in a small group before the class moves on.

Differentiation

Extra support. Students who stall: pull them into a small group and rebuild mental division with concrete materials or a simpler text before asking for the written work again. Do not send the page home as homework, it will just rehearse the misunderstanding.

Extension. Students who finish early: ask them to write their own mental division problem for a partner to solve, then check the partner's work. Creating a problem is harder than solving one and it surfaces whether they really understand mental division.

Skills covered in this lesson

Division facts practice (1-10) · Division facts practice (1-12) · Division facts (missing dividend or divisor) · Divide by 10 or 100 · Divide by whole tens or hundreds · Divide whole tens or hundreds by 1-digit · Single digit division (no remainder) · Division with remainder (1-100) · Division with remainder, divisor a whole ten · Division with remainder, divisor a whole hundred · Multiplication and division word problems · Mixed 4 operations word problems