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.



** For base ten virtual manipulatives, see links on place value page.
http://gcamath2.weebly.com/placevaluebasetenunderstanding.html
2.NBT.6 Add up to four twodigit 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 threedigit 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.
Additional Online Games and Resources:
Add Multiples of 100: https://www.ixl.com/math/grade2/addmultiplesof100
Write an Addition Sentence: https://www.ixl.com/math/grade2/writetheadditionsentenceuptothreedigits_
Write an Addition Sentence: https://www.ixl.com/math/grade2/writetheadditionsentenceuptothreedigits_