Maryland Math 5.NOS.B.4.c

Math5th GradeNumber and Operation Sense

The Standard

Use a standard algorithm to multiply.

Maryland College and Career Ready Standards for Mathematics (2025) · PERFORM OPERATIONS ON MULTI-DIGIT WHOLE NUMBERS AND WITH DECIMALS TO HUNDREDTHS.

Teacher's field guide

What Students Need to Do: Students multiply multi-digit numbers with the standard written algorithm. They place each partial product in the correct column and account for decimal places when needed.
What Mastery Looks Like: A student gets 9,048 for 348 × 26 and 3.12 for 2.4 × 1.3. Their work shows correctly placed partial products, and their estimates fit both answers.
Common Misconceptions: Students may put the tens partial product in the ones column or lose a carried digit. With decimals, they may line up decimal points as if adding.
How to Assess It: Exit ticket: Solve 34 × 26 and 2.4 × 1.3 with the standard algorithm. Write an estimate beside each answer.

Lesson moves

Tile a 23 by 14 rectangle on graph paper, then mark which sections match each row of the written algorithm.
Ask students to explain why the second row of 47 × 32 starts in the tens column.
Show 56 × 24 with an incorrect tens row; have partners find the error and correct the product.
Have students calculate the cost of 16 notebooks at $2.35 each, then check the total with an estimate.

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