Addition and Subtraction to 1,000September 8-9, 2015September 15-16, 2015

Standard

0 CCSS.MATH.CONTENT.3.NBT.A.20 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.

Objective

0Students will use place value understanding and properties of operations in order to perform multi-digit arithmetic (addition and subtraction) up to 1000.

Homework

0Due on Friday , September 11th

0 Worksheet 1: Adding and Subtracting Up to 1000

0Due on Tuesday, September 15th

0 Worksheet 2: Word Problems

Essential Questions

0 How can sums and estimates be estimated?

0 What strategies can be used to find sums and differences?

0 How are addition and subtraction alike? Different?

Addition of Numbers

What I Know

0Students are to complete the following example in THEIR journals:

0 743 + 127 =

Rules for addition

0 Line up all your numbers by PLACE VALUE.0 Add up all numbers starting at the ones place.0 Add tens and hundreds, remember to carry the ‘1’, if

necessary:

0 234 246 0 + 12 +1240

Ways to show addition(Follow teacher on chart paper)

0Estimate.0Use Models0Addition Algorithm

0 3960 +142

Subtraction of Numbers

What I Know

0Students are to complete the following example in THEIR journals:

0 743 - 127 =

Rules for Subtraction0Subtraction (-) means to take away. • The difference is the answer to a subtraction problem.• To subtract, numbers are lined up by the place value of their digits.

0Decomposing a number means moving a group of numbers to the next lower place value.

• Decomposing is needed when the bottom digit is greater than the top digit in a place-value column1

Rules of Subtraction

0 Read the problem and identify what is being subtracted, if necessary.

0 Line up the numbers by the place value of their digits, if necessary.

0 Subtract the digit in each place value. Hint: Start from the ones place.

0 Decompose a number, if needed. 0 Hint: Move a group of numbers to the next lower place

value.0 Interpret the difference. “The difference of _______ and

_______ is _______.”

Rules for Subtraction

0Line up your numbers by PLACE VALUE.0Subtract the ones, regroup if necessary.0Subtract the tens and hundreds, borrow

from the next number and regroup if necessary.

0Perform an ADDITION check.

Classwork

0Math Text Books:9/8/2015 & 9/9/2015 (Addition)0Pages 100 – 102 # 1-170(Using Models) Pg 95 # 4-9

Classwork

9/15/2015 & 9/16/2015 (Subtraction) Page 161 # 3-11 Page 167 # 2-9

EXIT SLIP(Complete in Journal)

0Aarya read 573 pages during the PG County Summer Reading Challenge. She was only required to read 399 pages. How many extra pages did Aarya read?

Reminder

0 Quiz on Adding and Subtracting up to 1000 on Wednesday, September 16th.