## Represent and solve problems involving addition and subtraction

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.

## Related Lessons

Lesson 207

Warm up with a Mystery Math Mistake to find the mistake made in counting up on a number line to subtract. Use visual models to practice adding and subtracting lengths of objects within 100.

Lesson 201

Warm up with a Mystery Math Mistake to hunt for the mistake in adding two 2-digit numbers using a decomposition [...]

Lesson 202

Warm up with a Mystery Math Mistake as you add two 2-digit numbers using a decomposition strategy. Find Which One [...]

Lesson 318

Join Mrs. McCartney for a Mystery Math Mistake - T-Pops needs your help with subtraction! We'll solve addition and subtraction story problems involving money.

Lesson 308

Join Mrs. McCartney for a word problem with Professor Barble that will make more sense with a visual model. Get ready to have fun using attributes like sides, corners, side lengths and square corners to create shapes!

Lesson 307

Join Ms. Askew for a division word problem with her friend Professor Barble. Next, get ready to start to explore fractions by learning about partitioning parts of a whole!

Lesson 310

Join Mrs. McCartney for some fun with Professor Barble doing a tricky comparison word problem. Next we are going have some fun with pattern blocks composing different shapes. How many ways can you make a hexagon?

Lesson 305

Join Mrs. McCartney to learn how to do a comparison word problem with Professor Barble! Next, we are going to work on comparing 3 Digit numbers with a game of true and false! Plus we will use numberline, Value Pak, Place Value discs and blocks to compare! Which tool will you pick to use?

Lesson 306

Join Mrs. McCartney for a comparison word problem with her friend Professor Barble. Next, get ready to order 3-digit numbers using place value understanding. We will be using number lines and Value Pak to help apply our thinking.

Lesson 303

Join Mrs. McCartney for a word problem with Professor Barble using Visual Models! Next great ready to locate and compare 3-digit numbers on a number line! We may even see our friend Value Pak to help us!

Lesson 304

Join Mrs. McCartney to go on a mission to see if we can figure out Professor Barble's comparison word problem. Next, get ready for some fun with Value Pak and Base-Ten blocks as we compare 3-Digit Numbers