Videos and lessons to help Grade 3 students learn to 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.

Common Core: 3.NBT.2

### Suggested Learning Target

• I can add within 1000 by using an algorithm or strategy based on place value.
• I can subtract within a 1000 by using an algorithm or strategy based on place value.
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Adding and subtracting within 1,000--Lesson 1 of 7 (Common Core Standard 3.NBT.2)
In this lesson you will solve for unknown amounts by using addition and subtraction fact families.
Example: Laura had a bag of marshmallows. She and her friends ate 26 marshmallows. There are only 7 marshmallows left in the bag. How many marshmallows were in the bag to begin with?

Adding and subtracting within 1,000--Lesson 2 of 7
In this lesson you will solve addition problems by using complements of ten and their multiples.

Adding and subtracting within 1,000--Lesson 3 of 7
In this lesson you will solve addition word problems by identifying key phrases.
Example: Jasper wants to buy a present for his Mom's birthday. He only had \$19.00 to spend. His dad chipped in \$45.00 and his sister chipped in \$32.00. How much does Jasper have to spend on a present now?

Adding and subtracting within 1,000--Lesson 4 of 7
In this lesson you will solve subtraction word problems by identifying key phrases.
Example: Sdyney was climbing Longs Peak in Colorado. She stopped to rest at 12,325 feet. The peak is at 14,259 feet. How much farther does she have to climb?

Adding and subtracting within 1,000--Lesson 5 of 7
In this lesson you will solve subtraction problems by finding the distance between two numbers on a number line.
Example: Nabisco produces 688 tons of Oreos everyday. It also produces 371 tons of Ritz crackers. How many more tone of Oreos are produced each day?

Adding and subtracting within 1,000--Lesson 6 of 7
In this lesson you will solve addition problems by using the partial sums method.
Example: Natalie went to visit her relatives. First, she traveled 1,376 miles to visit her Aunt in Colorado and then she drove 682 miles to get to het Grandma's house in Iowa. How many miles did she travel in all?

Adding and subtracting within 1,000--Lesson 7 of 7
In this lesson you will solve for unknowns by applying the commutative property.

Grade 3 / Math / Number Sense
CCSS: Math.3.NBT.A.2
Lesson Objective
Use the strategies of decomposing, jumps of ten, and splitting

Check addition and subtraction problems using the inverse operation.

Solve addition problems with numbers up to 1,000 by regrouping.

Solve addition problems using key vocabulary.

Solve subtraction problems using key vocabulary.

Solve subtraction problems using equal groups.

Solve subtraction problems using regrouping.

Solve subtraction problems using number line.