Florida B.E.S.T. MA.3.AR.1.1
The Standard
Apply the distributive property to multiply a one-digit number and two-digit number. Apply properties of multiplication to find a product of one-digit whole numbers.
Florida B.E.S.T. Standards for Mathematics
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students split a two-digit factor into tens and ones, multiply each part, then add the partial products. They also rearrange or regroup factors and use known facts to find unknown products.
What Mastery Looks Like
- Given 6 × 24, a student writes 6 × 20 + 6 × 4 and finds 144. The student can switch or regroup one-digit factors to make a calculation easier and explain why the product stays equal.
Common Misconceptions
- Students may calculate 4 × 23 as 80 + 3, forgetting to multiply the ones. They may write 4 × 23 = 4 × 20 + 3 or combine 80 and 12 as 8012. Some think changing the factor order changes the product.
How to Assess It
- Exit ticket: Solve 7 × 16 by breaking apart 16, then solve 5 × 8 × 2 by regrouping the factors. Show each equation.
Lesson moves
Ways to Teach It
Build six groups of 24 with base-ten blocks, split each group into tens and ones, then record 6 × 20 + 6 × 4.
Ask, “Why does 7 × 18 equal 7 × 10 + 7 × 8?” Students draw an array and write a two-sentence explanation.
Partners draw three digit cards, choose two factors to multiply first, and score a point for a correct regrouping equation.
Pose: Six tables each need 23 pencils. Students split 23 into 20 and 3 to find and justify the total.
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Printable MA.3.AR.1.1 Worksheet
A ready-to-print activity worksheet aligned to MA.3.AR.1.1, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- MA.4.NSO.2.3
Multiply two whole numbers, each up to two digits, including using a standard algorithm with procedural fluency.
- MA.3.NSO.2.2
Explore multiplication of two whole numbers with products from 0 to 144, and related division facts.
- MA.3.NSO.2
Add and subtract multi-digit whole numbers. Build an understanding of multiplication and division operations.
- MA.5.NSO.2.2
Divide multi-digit whole numbers, up to five digits by two digits, including using a standard algorithm with procedural fluency. Represent remainders as fractio...
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