**1.1 Number System—Addition and Subtraction, Place Value and Patterns in Addition**

3.OA.8-Solve two-step word problems using the four operations. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including rounding.33.OA.8-Solve two-step word problems using the four operations. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including rounding.3

Letter Standing for Unknown-click here

**TWO STEP PROBLEMS**

Solving word problems__-__click hereSolving word problems

__-__click hereword problems-click here

__THE COUNTING GAME-__CLICK HERE

Interactive game for beginning multiplication; student selects number to count by learning multiples

__MATH HOOPS-__CLICK HERE

Math Hoops provides word problem practice for students in grades 3 to 5. All word problems use whole numbers but the problems range from single step addition to multistep equations

__GRANDSLAM MATH-__CLICK HERE

Interactive game designed to help you become better at solving word problems. The questions start out easy and then get a little harder as you go

Find Number Patterns-click here

3 This standard is limited to problems posed with whole numbers and having whole-number answers; students should know how to perform operations in the conventional order when there are no parentheses to specify a particular order (Order of Operations).

3.OA.9 Identify arithmetic patterns (including patterns in the addition table or multiplication table), and explain them using properties of operations.3 This standard is limited to problems posed with whole numbers and having whole-number answers; students should know how to perform operations in the conventional order when there are no parentheses to specify a particular order (Order of Operations).

3.OA.9 Identify arithmetic patterns (including patterns in the addition table or multiplication table), and explain them using properties of operations.

*For example, observe that 4 times a number is always even, and explain why 4 times a number can be decomposed into two equal addends.*Find Number Patterns-click here

**Pattern Chomper-click here**

*3.NBT.1 Use place value understanding to round whole numbers to the nearest 10 or 100.*

**Rounding whole numbers video**-**click here**

**sea shell rounding**-**click here***Rounding*

RULES FOR ROUNDING

**-****click here**RULES FOR ROUNDING

__-__click here**3.NBT.2 Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.**

__3 digit addition split__-click here__-click here__

**doubling to 1000**__-click here__

**difference add****Essential questions**

• How do you explain the relationship between addition and subtraction?

• How did you solve the two-step word problem? Explain your thinking.

• How can you use an equation to represent the problem and the unknown?

• How can you solve the problem? Explain your thinking.

• What patterns did you notice when using addition and subtraction? How did you find them?

• How do you use place value to round numbers?

• How can the use of estimation make logical problem-solving decisions?

• How can you check your answer?