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

reciprocal/multiplicative inverse

"flipping a fraction" 7/3 is the reciprocal of 3/7; when you multiply a fraction and its reciprocal you get 1.

a ratio that compares a number to 100.

a number that can be written as a ratio of two numbers.

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EUS 2/3/4 Regular

Vocabulary for Fractions, Decimals and Ordering

Question	Answer
compatible numbers	numbers that are easy to add, subtract, multiply, or divide mentally.
reciprocal/multiplicative inverse	"flipping a fraction" 7/3 is the reciprocal of 3/7; when you multiply a fraction and its reciprocal you get 1.
greater than or equal to	at least.
less than or equal to	no more than.
percent	a ratio that compares a number to 100.
rational numbers	a number that can be written as a ratio of two numbers.