Addition, Subtraction, & Estimation

A number being added or joined together with another number(s).

• addend
• counting (natural) numbers
• sum
• fluency

The set of positive numbers that begins at one and increases by one each time {1, 2, 3, ..., n}

• counting (natural) numbers
• sum
• fluency
• whole numbers

The total when two or more addends are joined.

• sum
• fluency
• whole numbers
• polygon

A person's understanding of numbers and are able to know there are 5 without counting them one by one.

• fluency
• whole numbers
• polygon
• difference

The set of counting (natural) numbers and zero {0, 1, 2, 3, ..., n}.

• whole numbers
• polygon
• difference
• equation

A closed figure with at least 3 sides and where all sides are straight (no curves).

• polygon
• difference
• equation
• compatible numbers

The remaining amount after the subtrahend has been subtracted from the minuend.

• difference
• equation
• compatible numbers
• consecutive

A math statement composed of equivalent expressions separated by an equal sign.

• equation
• compatible numbers
• consecutive
• expression

Numbers that are slightly adjusted to create groups of numbers that are easy to compute mentally.

• compatible numbers
• consecutive
• expression
• minuend

A pattern or sequence of numbers in order without interruption.

• consecutive
• expression
• minuend
• perimeter