iReady 4th grade Math Unit 1 vocabulary

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Algorithm

Back

A set of routine steps used to solve problems.

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Estimate (verb)

Back

To give an approximate number or answer based on mathematical thinking.

Front

Expanded Form

Back

A way a number is written to show the place value of each digit. For example, 249 = 200 + 40 + 9.

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Period

Back

A group of three places in a number, usually separated by commas. The first three periods are the ones period, the thousands period, and the millions period.

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Reasonable

Back

Something that makes sense when given facts are taken into account.

Front

Regroup

Back

To compose or decompose ones, tens, hundreds, thousands, and so forth. 10 ones can be regrouped as 1 ten, or 1 hundred can be regrouped as 10 tens.

Front

Standard Form

Back

The way a number is written with numerals.

Front

Word Form

Back

The way a number is written with words or said aloud.