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## Subtracting 2 Digit Numbers - no regrouping

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Subtraction using the standard algorithm.

Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

## Equivalent Fractions on a Number Line

00:00

Explain equivalence of fractions in special cases, and compare fractions by reasoning about their size.

## Elapsed Time on a Number Line

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Tell and write time to the nearest minute and measure time intervals in minutes. Solve word problems involving addition and subtraction of time intervals in minutes, e.g., by representing the problem on a number line diagram.

## Fractions Equivalent to Whole Numbers

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Explain equivalence of fractions in special cases, and compare fractions by reasoning about their size.

## Even and Odd Numbers

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Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.

## Comparing numbers

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Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols to record the results of comparisons.

## Elapsed Time - Using a Number Line to Solve Word Problems

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Tell and write time to the nearest minute and measure time intervals in minutes. Solve word problems involving addition and subtraction of time intervals in minutes, e.g., by representing the problem on a number line diagram.

## Subtracting 3 Digit Numbers - with Regrouping

00:00

Subtraction using the standard algorithm.

Add and subtract within 1000, 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. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

## Adding 4 Two Digit Numbers

00:00

Add up to four two-digit numbers using strategies based on place value and properties of operations.

## Subtracting 2 Digit Numbers - with Regrouping

00:00

Subtraction using the standard algorithm.

Add and subtract within 1000, 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. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.