Everyday Math Grade 4 – Lesson 2.7 Addition of Multi-digit Numbers Copyright © 2010 Kelly Mott.

Lesson Components: Part 1: Math Boxes 2.7 Page 41Math Boxes 2.7 Page 41 Part 2: ReviewReview Part 3: PP Regroup the OnesPP Regroup the Ones Part 4: PP Regroup the TensPP Regroup the Tens Part 5: PP Regroup More than OncePP Regroup More than Once Part 6: PP Regrouping 4 DigitsPP Regrouping 4 Digits Part 7: Math Journal 39Math Journal 39 Part 8: Math Journal 40Math Journal 40 Copyright 2010 Kelly Mott

Math Boxes Lesson 2.7 Page 41

What number is in the tens place? ____________________________ hundred thousands place? ________________ ten millions place? ______________________ thousands place? _______________________ Place Value Practice 1 874693521 2

What number is in the hundreds place? ________________________ hundred millions place? __________________ ten thousands place? ____________________ millions place? _________________________ Place Value Practice 2 874693521 3

Value of a Number Practice 1 Problem #1: 290, 763, 891 What is the 8 worth? ___________________________ Problem#2: 856, 742, 121 What is the 7 worth? ___________________________ Problem#3: 260, 158, 403 What is the 6 worth? ___________________________ Copyright 2010 Kelly Mott 4

Expanded Form Practice 1 Problem 1: 116,350,601 __________________ + __________________ + __________________ Problem 2: 800,935,022 __________________ + __________________ + __________________ + __________________ Copyright 2010 Kelly Mott 5

1.What is the maximum? _________________________________________________________ 2.What is the minimum? _________________________________________________________ 3. What is the range (maximum minimum)? _________________________________________________________ 4. What is the mode (most frequent) ? _________________________________________________________ 5. What is the median (middle number)? _________________________________________________________ Copyright 2010 Kelly Mott LOOK AT THE DATA: 3 5 6 6 9 9 11 11 11 6

1.Lets look at another problem. 2.Start with the ones. 3.9 + 4 = 13 4.We can think of 13 as: 5.We can also think of 13 Understanding Regrouping the Ones 224 + 219 __________________ Copyright 2010 Kelly Mott 8

1.Lets look at one more problem. 2.Start with the ones. 3.8 + 9 = 17 4.We can think of 17 as: 5.We can also think of 17 Understanding Regrouping the Ones 448 + 249 __________________ Copyright 2010 Kelly Mott 9

1.When we add, we start with the ones column. 2.6 + 5 = 11 3.We can think of 11 as: 4.We can also think of 11 as: Understanding Regrouping the Ones 236 + 145 __________________ Copyright 2010 Kelly Mott 10

Heres a quick video to reinforce what we just learned: http://streaming.discoveryeducation.com/braingame s/iknowthat/Video/VideoPlayer.htm?VID=../Dojo/Vid eo/DoubleDigitAdditionWithRenaming.flv&SWF=Doj o&COL=#2c143e&W=400&H=420 Understanding Regrouping Copyright 2010 Kelly Mott

THREE DIGIT ADDITION REGROUP THE TENS

1.When we add, we start with the ones column. 2.4 + 1 = 5 ones 3.We dont have to regroup because 5 is a SINGLE DIGIT! 4.Then add the tens. 5.6 + 7 = 13 tens 6.We can think of 13 tens as: 7.We can also think of 13 tens as: Understanding Regrouping the Tens 261 + 174 __________________ Copyright 2010 Kelly Mott 16

THREE DIGIT ADDITION REGROUP MORE THAN ONCE

1.8 + 3 = 11 ones 2.We can think of 11 ones as: 3.We can also think of 11 ones as: 4.1 + 6 + 5 = 12 tens 5.We can think of 12 tens as: 6.We can also think of 12 tens as: Understanding Regrouping More Than Once 268 + 153 __________________ Copyright 2010 Kelly Mott 24

1.8 + 3 = 10 ones 2.We can think of 10 ones as: 3.We can also think of 10 ones as: 4.1 + 8 + 5 = 14 tens 5.We can think of 14 tens as: 6.We can also think of 14 tens as: Understanding Regrouping More Than Once 388 + 152 __________________ Copyright 2010 Kelly Mott 25

FOUR DIGIT ADDITION REGROUP MORE THAN ONCE

Everyday Math Grade 4 – Lesson 2.7 Addition of Multi-digit Numbers Copyright © 2010 Kelly Mott.

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