**2nd Grade Numbers of the Week** (Use for morning work or as homework)

**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.**Sample Activities:**

Add To: Result Unknown (within 100)

Take From: Result Unknown (within 100)**Math Read Aloud Task Cards:**One Hunter

P. Bear's New Year's Party

The Napping House

Two of Everything

Word Problems (within 100):

Add to: Change Unknown

Take From: Start Unknown

Put Together/Take Apart: Total Unknown

Compare: Difference Unknown

Compare: Bigger Unknown

Compare: Smaller Unknown

Mixed Addition/Subtraction Two Step

**Add and subtract within 20**

**Work with equal groups of objects to gain foundations for multiplication****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.**Sample Activities:**

Even Odd Scoop**Math Read Aloud Task Cards:**

Roll a Rectangular Array

Making Different Sized Squares

Making Rectangular Arrays

Array Cards

Array Match

**Understand place value**

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).

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

Counting Collections

Count by Fives (v. 4)**Math Read Aloud Task Card:**

Two Ways to Count to Ten**Also included in**** ****2nd Grade Math Centers:****Count by Fives (v. 1-3)Count by Tens (v. 1- 4)Skip Counting CardsMy Skip Counting Patterns Book**

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

Make Six Numbers

Roll 3 Digits

Numeral Writing Barrier Game**Also included in **2nd Grade Math Centers:**Number Word Concentration**

**2.NBT.A.4 **Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols.**Sample Activities:**Comparing 3 Digit Numbers

Place Value Challenge (v. 1)

**Use place value understanding and properties of operations to add and subtract**

2-Digit Addition Split

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

Make 100**Also included in ****2nd Grade Math Centers:****Add Three AddendsAdd Four AddendsThree Addend Word Problems**

**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.**Sample Activities:**Base Ten Bag: Addition

Base Ten Pictures

3-Digit Addition Split

Base Ten Bag: Subtraction

Make a Ten Path (v. 3)

**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.Sample Activities:**