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## Rounding to the nearest 10

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Use place value understanding to round whole numbers to the nearest 10 or 100.

## Multiplying by 10

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Multiply one-digit whole numbers by multiples of 10 in the range 10–90 (e.g., 9 × 80, 5 × 60) using strategies based on place value and properties of operations.

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Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number 100–900.

## Mentally Subtracting 10

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Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number 100–900.

## Mentally Subtracting 10

Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

## Counting by 10s to 120

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Count to 120, starting at any number less than 120. In this range, read and write numerals and represent a number of objects with a written numeral.

## Subtracting Multiples of 10

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Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.

## Multiplying and Dividing Decimals by a Power of 10

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Explain patterns in the number of zeros of the product when multiplying a number by powers of 10, and explain patterns in the placement of the decimal point when a decimal is multiplied or divided by a power of 10. Use whole-number exponents to denote powers of 10.

## Using Number Lines to Subtract 10's and 100's

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Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2, ..., and represent whole-number sums and differences within 100 on a number line diagram.

## Using Number Lines to Add 10's and 100's

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Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2, ..., and represent whole-number sums and differences within 100 on a number line diagram.