Second Grade Number
& Operations in Base Ten


Place value, mental addition and subtraction, skip counting and multiple digit addition. Click on the blue links to display or print pdfs.  
Standards 
Practice
Pages


Understand place value  Cluster 1 

Standard
2.NBT.1:
Understand that the three digits of a threedigit number represent
amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0
tens, and 6 ones. Understand the following as special cases: 
Sets of 10s and 1s Answers 2.NBT.1.a 
Hundreds Table Answers 2.NBT.1.b 
Standard 2.NBT.2: Count within 1000; skipcount by 5s, 10s, and 100s.  Count within 1000 Answers 2.NBT.2.a 
Count by 5s Answers 2.NBT.2.b 
Standard 2.NBT.3: Read and write numbers to 1000 using baseten numerals, number names, and expanded form.  Convert to Numbers Answers 2.NBT.3.a 
Expanded Form Answers 2.NBT.3.b 
Standard 2.NBT.4: Compare two threedigit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, < and symbols to record the results of comparisons.  Compare Numbers Answers 2.NBT.4.a 
Greater Than Digit Answers 2.NBT.4.b 
Use place value understanding and properties of operations to add and subtract  Cluster 2 

Standard 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.  Add Down 2 + 1 Digit Answers 2.NBT.5.a 
Subt Across Answers 2.NBT.5.b 
Standard 2.NBT.6: Add up
to four twodigit numbers using strategies based on place value and
properties of operations. 
Add down 3 x 1 digit Answers 2.NBT.6.a 
Add across 4 with 3 x 2 digit Answers 2.NBT.6.b 
Standard 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 composeor decompose tens or hundreds.  Add in Columns Answers 2.NBT.7.a 
Subtract Rows Answers 2.NBT.7.b 
Standard 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.  Mentally add 10s Answers 2.NBT.8.a 
Mentally add 100s Answers 2.NBT.8.b 
Standard 2.NBT.9: Explain why addition and subtraction strategies work, using place value and the properties of operations.  Explain Addition Answers 2.NBT.a 
Commutative Property Answers 2.NBT.b 