NY Next Generation Math NY-3.OA.4

Math3rd GradeRepresent and solve problems involving multiplication and division.

The Standard

Determine the unknown whole number in a multiplication or division equation relating three whole numbers.

New York State Next Generation Mathematics Learning Standards

Teacher's field guide

What Students Need to Do: Students find a missing whole number in a multiplication or division equation. They use the relationship between multiplication and division to determine the unknown.
What Mastery Looks Like: The student finds the unknown in 8 times n = 56 and 56 divided by n = 8. The student checks the answer with a related equation.
Common Misconceptions: Students may treat the unknown symbol as an operation sign. They may use the two visible numbers in order without considering their relationship.
How to Assess It: Give n times 7 = 42 and 42 divided by n = 6. Ask students to solve both and write a related fact that checks each answer.

Lesson moves

Build fact triangles with three number cards, hiding one number for a partner to find.
Ask students how a multiplication fact can solve a division equation with an unknown divisor.
Play Missing Number Relay with multiplication and division equations within 100.
Find the missing number of items per package from a total and a known number of packages.

Free download

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