Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, 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. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.

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Students need to master the basic operations. The common core suggests that all four operations are mastered by the end of third grade. This lesson will help determine where to start and what to do next.

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Students have been learning about tens and ones. This day allows them to apply what they know to a "real life" farm crisis! The chickens have laid a bunch of eggs and students have to figure out how many the farmer is collecting!

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Students explore how they could arrange their cubes to solve story problems with numbers on the decade. This exploration pushes them to understand how arranging into tens helps them solve story problems with big numbers!

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Hundreds charts allow for children to visually follow along and see how the numbers grow as they apply the counting on strategy to greater numbers.

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Blending is not just for ELA teachers! Today students will learn to "blend" (combine) two sets of dots and then compare the number to another using greater than by playing versions of previous learned activities.

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Students will use their ability to count by tens on and off the decade by taking part in an activity that requires them to start with a number of cubes and then repeatedly add ten.

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Head to the library and figure out how many books are stacked up! Students look back at their strategies from yesterday's lesson and revisit the best ways to solve these problems using what they know about place value!

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Go round and round...Round and round...round and round! Sing The Wheels on the Bus while students apply base 10 understanding to change problems.