Pairs of numbers that are easy to add, subtract, multiply, or divide mentally.

A rough calculation of the value, number, quantity, or extent of something.

Rounding means making a number simpler but keeping its value close to what it was.

About, a little more/less than, close to, approximately

Common fractions that we can measure or judge against, when measuring, comparing or ordering other fractions.

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5 Math Basics

Estimation TEK 5.3A

Term	Definition
Compatible Number	Pairs of numbers that are easy to add, subtract, multiply, or divide mentally.
Estimation	A rough calculation of the value, number, quantity, or extent of something.
Round	Rounding means making a number simpler but keeping its value close to what it was.
Estimation Language	About, a little more/less than, close to, approximately
Benchmark Fraction	Common fractions that we can measure or judge against, when measuring, comparing or ordering other fractions.