Lecture Notes: Perimeter and Multiplication - Vocabulary Flashcards

A set of vocabulary flashcards covering key terms from perimeter concepts, shapes, and multiplication methods discussed in the notes.

Perimeter

The distance around the outside edge of a two‑dimensional shape; described as the rim.

Rim

The edge or border of a shape; used colloquially as a synonym for perimeter.

Rectangle

A parallelogram with four right angles; opposite sides are equal.

Parallelogram

A four‑sided figure with opposite sides parallel; like a rectangle that has been tilted.

Length

The longer dimension of a rectangle or parallelogram; one of the sides.

Width

The shorter dimension of a rectangle or parallelogram; the other side.

Multiplication

An arithmetic operation representing repeated addition; combining equal groups.

Times symbol (×)

The multiplication symbol used to indicate a product.

Dot (·) as multiplication symbol

A dot used as a multiplication sign, common in algebra and higher math.

Repeated addition

Adding the same number multiple times; the concept behind multiplication.

Number line model

A visual way to model multiplication by making successive jumps of the size of a factor.

Groups model

Model multiplication as a number of groups of a given size.

Commutative property (multiplication)

Changing the order of the factors does not change the product (ab = ba).

Associative property (multiplication)

Grouping of factors does not change the product ((ab)c = a(bc)).

Additive identity

0; adding zero to a number leaves it unchanged.

Multiplicative identity

1; multiplying a number by one leaves it unchanged.

Zero property of multiplication

Any number multiplied by zero equals zero.

Expanded notation

Writing numbers in expanded form (place-value components) to multiply step by step.

Partial products

The individual products obtained when multiplying parts of numbers; then added together.

Lattice method

A grid-based multiplication method using a rectangle and diagonals to sum partial products.

Diagonal sums

The sums along diagonals in the lattice method, which may require regrouping (carrying).

Carrying

Regrouping tens or higher to the next left place when a sum exceeds 9.