CCSS.Math.Content.4.OA.B

CCSS.Math.Content.4.OA.B is a cluster heading. These are the individual standards under it.

• CCSS.Math.Content.4.OA.B.4

  Find all factor pairs for a whole number in the range 1—100. Recognize that a whole number is a multiple of each of its factors. Determine whether a given whole...

01

What Students Need to Do

Students find factor pairs for whole numbers from 1 through 100. They identify multiples and decide whether a number is prime or composite.

02

What Mastery Looks Like

Students find all factor pairs for a whole number through 100 without missing or repeating pairs. They identify multiples and correctly classify numbers as prime or composite.

03

Common Misconceptions

Students may confuse factors with multiples or list only one number from each factor pair. They may call 1 prime or assume every odd number is prime.

04

How to Assess It

Give 36 as an exit ticket. Ask students to list every factor pair, name three multiples, and classify 36 as prime or composite.

1. 01

   Give pairs 24 counters to build every possible rectangular array, then record each array as a factor pair.

2. 02

   Ask students to explain in writing how they know whether 27 is prime or composite.

3. 03

   Play a card sort where students place number cards under factor of 24, multiple of 6, both, or neither.

4. 04

   Plan equal rows for 48 chairs, then compare which seating arrangements work and connect each arrangement to a factor pair.

• CCSS.Math.Content.5.NF.B.4

  Apply and extend previous understandings of multiplication to multiply a fraction or whole number by a fraction.

• CCSS.Math.Content.6.NS.B

  Compute fluently with multi-digit numbers and find common factors and multiples.

• CCSS.Math.Content.2.OA.C

  Work with equal groups of objects to gain foundations for multiplication.

• CCSS.Math.Content.5.NF.B

  Apply and extend previous understandings of multiplication and division to multiply and divide fractions.