Florida B.E.S.T. MA.3.NSO.2.3

Math3rd GradeAdd and subtract multi-digit whole numbers. Build an understanding of multiplication and division operations.

The Standard

Multiply a one-digit whole number by a multiple of 10, up to 90, or a multiple of 100, up to 900, with procedural reliability.

Florida B.E.S.T. Standards for Mathematics

Teacher's field guide

What Students Need to Do: Students multiply a one-digit number by whole tens or whole hundreds. They use a basic multiplication fact, then apply place value to find the product.
What Mastery Looks Like: A student can solve problems such as 7 × 60 = 420 and 4 × 800 = 3,200 accurately. They can explain that 7 × 6 tens equals 42 tens.
Common Misconceptions: Students may attach the wrong number of zeros or treat a factor such as 60 as 6. Some may calculate 7 × 60 as 42 instead of 42 tens, or 420.
How to Assess It: Exit ticket: Solve 6 × 70 and 4 × 800. Choose one problem and explain the answer using tens or hundreds.

Lesson moves

Use place-value disks to build four groups of 30 and three groups of 200, then combine them and record each equation.
Ask students to explain in writing why 8 × 50 has the same basic fact as 8 × 5 but a different value.
Partners draw a one-digit card and a tens or hundreds card, multiply them, and earn a point for each correct product.
Present six crates holding 300 oranges each, and have students find the total and label the units in their equation.

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