SALTA 3rd grade

Focus

Standards

Curriculum Supports – enVision 2020

Vocabulary

3.NBT.1 3.NBT.2 3.OA.9

Strand: Numbers and Operations in Base Ten

Topic 8: Use Strategies and Properties to Add and Subtract

Topic 8: •

associative (grouping) property of addition • commutative (order) property of addition • identity (zero) property of addition • open number line • round • place value • compatible numbers • inverse operations

Third grade students use place value understanding and properties of operations to perform multi-digit arithmetic. A range of algorithms may be used.

Pick A Project: Oranges are Appealing, Road Trip, You Can Count on Me, Making Sense of the Census

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

No 3-Act Task for Topic 8

8-1 Addition Properties 8-2 Algebra: Addition Patterns 8-3 Mental Math: Addition 8-4 Mental Math: Subtraction 8-5 Round Whole Numbers 8-6 Estimate Sums 8-7 Estimate Differences

Standard 3.NBT.2 Fluently add and subtract within 1,000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction. Standard 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.

8-8 Relate Addition and Subtraction 8-9 Problem Solving: Model with Math

Topic 8: Manipulatives •

Two-color Counters Place Value Blocks

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Assessment Options: Topic 8 Assessment – Use Strategies and Properties to Add and Subtract (print or online) Topic 8 Performance Assessment - Use Strategies and Properties to Add and Subtract Team Created Assessment

District Wide Standards-Based Assessment #2 (Window: January 13 – January 28)

Assessment Tasks – Topic 8

Procedural Check

Application Task

3.NBT.1

Give students a paper with a number line labeled 200 – 300. Have them place the following five numbers on the number line: 225, 279, 250, 205, 290. Have them write to justify why each number was placed in the particular position on the number line. (DOK 3) Jerry rolled three number cubes and made 871. Leah rolled three number cubes and made 932. If rounded to the nearest hundred, would both of the numbers be the same? Use a number line to justify your answer. (DOK 3)

Which is more accurate: rounding to the nearest 100 or the nearest 10?