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.

Practice Pages
Understand place value - Cluster 1

Standard 2.NBT.1:  Understand that the three digits of a three-digit 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; skip-count 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 base-ten 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 three-digit 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 two-digit 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 three-digit 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