2ND GRADE NUMBER

Represent and solve problems involving addition and subtraction

2.OA.A.1 Use addition and subtraction within 100 to solve one and two step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g. by using drawings and equations with a symbol for the unknown number to represent the problem.

Word Problems: Add To: Result Unknown  (within 100)
Word Problems: Take From: Result Unknown  (within 100)
Literature Link: Two of Everything
Literature Link: The Napping House
Literature Link: Counting Crocodiles
Literature Link: Night Noises
Literature Link: The Shopping Basket
Literature Link: My Little Sister Ate One Hare

Add and subtract within 20

2.OA.B.2 Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.

Find Ten
Sum Search (9 & 10)
Four in a Row Subtraction
Doubles Plus Two (ver. 1)
The Difference Game (ver. 2)

2.OA.C.3 Determine whether a group of objects (up to 20) has an odd or even number of members, e.g. by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.

Even Odd Scoop
Odd and Even Chase

2.OA.C.4 Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns; write an equation to express the total as a sum of equal addends.

Roll a Rectangular Array
Array Match (Set 1)

2.NBT.A.1 Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones. Understand the following as special cases:

a. 100 can be thought of as a bundle of ten tens – called a “hundred.” 
b. The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, nine hundreds (and 0 tens and 0 ones).

Race to 100
Base 10 Concentration (v.2)

2.NBT.A.3 Read and write numbers to 1000 using base-ten notation, number names, and expanded form.

Roll 3 Digits
Numeral Writing Barrier Game

2.NBT.A.2 Count within 1000; skip count by 5s,10s, and 100s.

Skip Counting Patterns
Count by Fives (v.2)

2.NBT.A.4 Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols.

Comparing 3 Digit Numbers
Place Value Challenge (v.1)

2.NBT.B.5 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

Four in a Line with Near Doubles 
Make a Ten Path (ver. 2)

2.NBT.B.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.

Base Ten Bag: Addition
Base Ten Pictures
3-Digit Addition on an Open Number Line (ver. 1)

2.NBT.B.6 Add up to four two-digit numbers using strategies based on place value and properties of operations.

Make 100

2.NBT.B.8 Mentally add 10 or 100 to a given number 100-900 and mentally subtract 10 or 100 from a given number 100-900.

Add 10 on a Number Line (3 digit)
Add 10 and 100

2.NBT.B.9 Explain why addition and subtraction strategies work, using place value and the properties of operations.