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 a quick count-around or number talk that touches mental division. Ask students where they have seen mental division outside of math class. You are listening for who already has the vocabulary and who does not, so keep it light and let several students answer.

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

   Work two examples of mental division on the board, thinking out loud the whole way. Say the quiet parts: what you notice first, which step you do next, and why. Deliberately make one small error on the second example and let the class catch it.

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