4th Grade · Math · 4.OA.B.4
Factoring Lesson Plan for 4th Grade
A ready-to-teach factoring lesson for 4th Grade. Everything below is classroom-tested structure: an objective, a 45-minute sequence, a way to check who got it, and 6 printable practice pages.
Approximately 45 minutes
Learning objective
- Identify all factor pairs for numbers between 4 and 50
- List every whole number that divides evenly into a given number
- Build understanding of divisibility for numbers up to 50
Materials
- Prime Factor Trees - Blue TV
- Prime Factor Trees - Cool Koala
- Prime factor trees
- Prime factors
- Divisibility rules
- Multiples of whole numbers
- Pencils, and whiteboard space for the modeled examples
Lesson steps
1. Warm up together (5 min)
Open with a quick count-around or number talk that touches factoring. Ask students where they have seen factoring 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. Model it (I do) (10 min)
Work two examples of factoring 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. 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. Independent practice (you do) (15 min)
Hand out "Prime Factor Trees - Blue TV". 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. 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 factoring retaught in a small group before the class moves on.
Differentiation
Extra support. Students who stall: pull them into a small group and rebuild factoring 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 factoring 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 factoring.
Skills covered in this lesson
Find the factors of a number between 4 and 50 · Find the factors of a number between 4 and 100 · Prime factor trees · Prime factors · Divisibility rules · Multiples of whole numbers · Missing factors · Factoring
