Maryland Math 4.NOS.B.5.d
The Standard
- 4.NOS.B.5
- Multiply a whole number of up to four digits by a one-digit whole number, and multiply two two-digit numbers.
Represent and explain the computation by connecting rectangular arrays, area models, and/or equations to the meaning of multiplication.
Maryland College and Career Ready Standards for Mathematics (2025) · USE PLACE VALUE UNDERSTANDING AND PROPERTIES OF OPERATIONS TO PERFORM MULTI-DIGIT ARITHMETIC.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students draw an array or a split rectangle to show a multiplication problem. They find the product of each part, add the parts, and explain how the equation matches the drawing.
What Mastery Looks Like
- For 23 × 14, a student splits the sides into 20 + 3 and 10 + 4. They find 200, 80, 30, and 12, add them to get 322, and show where each number appears in the drawing.
Common Misconceptions
- Students may multiply only the tens together and the ones together, leaving out two parts of the rectangle. Others label 20 × 4 as 24 instead of 80.
How to Assess It
- Exit ticket: Draw a split rectangle for 12 × 14, label all four smaller products, and write an equation for the total. Explain why the equation matches your drawing.
Lesson moves
Ways to Teach It
Give pairs grid paper to shade a 13 by 12 array, split it at 10 on each side, and count the four sections.
Show 23 × 14 as 200 + 80 + 30; ask students to sketch the missing section and correct the equation.
Partners draw two cards numbered 11 through 19, build a split rectangle, and check each other's four partial products.
Give students a 23 by 14 meter garden plan; ask them to split it into four rectangles and calculate the planting area.
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Printable 4.NOS.B.5.d Worksheet
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Related Standards
- 5.NOS.D.16.d
Represent and explain the computation by connecting visual fraction models and/or equations to the meaning of division with unit fractions.
- 5.NOS.B.5.d
Represent and explain the computation by connecting rectangular arrays, area models, and/or equations to the meaning of division.
- 4.NOS.B.6.d
Represent and explain the computation by connecting rectangular arrays, area models, and/or equations to the meaning of division.
- 5.NOS.B.7.e
Represent and explain the computation by connecting concrete models, drawings, and/or equations to the meaning of multiplication and division.
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