2.NBT.5. Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
2.NBT.6. Add up to four two-digit numbers using strategies based on place value and properties of operations.
2.NBT.7. 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.
2.NBT.8. Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number 100–900.
2.NBT.9. Explain why addition and subtraction strategies work, using place value and the properties of operations.
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Tags : Add 2 and 3 digit numbers, simple word problems on addition - find a number if sum of 2 numbers and 1 number is given, missing numbers in a series, more than.
Tags : Subtract 2 and 3 digit numbers, simple word problems on subtraction - find a number if difference of 2 numbers and 1 number is given, what should be subtracted to get the right number.
Addition - Pop the right balloons
Lesson on Subtraction.