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2 nd Grade- Unit 4

2 nd Grade- Unit 4. Represent and solve problems involving addition and subtraction.

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2 nd Grade- Unit 4

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  1. 2nd Grade- Unit 4 Represent and solve problems involving addition and subtraction. 2.oa. 1. 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. 2.nbt.5. Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction. 2.nbt.8. Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number 100– 900.2.nbt.9. Explain why addition and subtraction strategies work, using place value and the properties of operations.1

  2. Double Digit Addition • Base 10 Blocks: Adding Tens • Place Value Jumping • Base 10 Blocks Adding Ones • Regrouping • Base 10 Blocks: Adding Tens and Ones • Place Value Jumping and Regrouping • Partial Sums • Number Grids: Adding Tens • Place Value Jumping • Number Grids: Adding Ones • Regrouping • Number Grids: Adding Tens and Ones • Place Value Jumping • Number Grids- Compensation • Number Lines: Adding Tens • Place Value Jumping • Number Lines: Adding Ones • Regrouping • Number Lines: Adding Tens and Ones • Place Value Jumping • Open Number Lines • Friendly Landmarks • Compensation

  3. Unit 4 Goals Add 2 Digit Numbers Solve Problems

  4. Unit 4 Notes • Lesson Outlines • Number Talk • Mini-Lesson • Independent Practice • Problem Solving • Homework *Some slides are blank so you can differentiate as you see fit. *Problem solving slides have some abstract language and/or missing information. We did not include 2 step problems so students can focus on computation skills during lessons. Use blank slides to add 2 step problems when students are ready. *Bar modeling slides are included separately- use as you see fit (within a lesson or as separate lessons) *The standard requires students to add 3 digit numbers- if students are ready, modify content to 3 digit addition. We will do a follow up unit with 3 digit numbers lately. *Future units on 3 digit addition and 2 and 3 digit subtraction will be based on the same models and strategies so making any connections now will build the framework for future lessons.

  5. Base 10 Blocks

  6. I Can Use Base 10 Blocks to Understand and Represent Addition of 2 Digit Numbers. +

  7. Lesson 1- Base 10 Blocks- Counting On by 10’s • Number Talk • String- Counting on by 10’s • Mini-lesson: • Students use base 10 blocks to count by tens (slide) • R6-1 • Students use base ten blocks to count on by tens from a 2 digit number (slide) • Independent Practice • Students use base ten blocks to count on by tens from a 2 digit number (slide) • Homework/Extra practice • Students use base ten blocks to count on by tens from a 2 digit number (slide) • EM107

  8. Lesson 4.1Number Talk: Place Value Jumping 20+10 40+10 20+20 40+20 20+30 40+30

  9. Lesson 4.1-1: I Can Add Tens To a 2 Digit Number Using Base 10 Blocks

  10. Lesson 4.1-2: I Can Add Tens To a 2 Digit Number Using Base Ten Blocks

  11. Lesson 4.1 Independent Practice:I Can Add Tens To a 2 Digit Number Using Base Ten Blocks

  12. Lesson 4.1 Homework:I Can Add Tens To a 2 Digit Number Using Base Ten Blocks

  13. Lesson 4.2- Base 10 Blocks- Counting On by 10’s • Number Talk • String- Counting on by 10’s • Mini-lesson: • R6-1 • Students use base 10 blocks to create a number (slide) and add tens to the number. Students find the sum of the numbers. (slide) • Students use base ten blocks to count on by tens from a 2 digit number (slide) • Independent Practice • Students use base ten blocks to add tens to a 2 digit number (slide from lesson) • Problem Solving • Students solve a problem using • A bar model and number model to make a plan • Base to blocks to solve the problem • A labeled answer • Homework/Extra practice • Students use base ten blocks add tens to a 2 digit number (slide) • R6-1 revised • EM107 revised

  14. Lesson 4.2 Number Talk: Place Value Jumping 25+10 42+10 25+20 42+20 25+30 42+30

  15. Lesson 4.2: I Can AddTens to 2 Digit Numbers With Base 10 Blocks

  16. Lesson 4.2: I Can Add Tens to 2 Digit Numbers With Base 10 Blocks (Lesson and Practice)

  17. Lesson 4.2 Problem Solving- Adding Tens With Base 10 Blocks • John had 24 baseball cards. He just bought a pack of 20 new cards. How many cards does he have now? Number Model: _____+______=_______ Answer: _____________________ Units

  18. Lesson 4.2 Problem Solving- Adding Tens With Base 10 Blocks Number Model: _____+______=_______ Answer: _____________________ Units

  19. Lesson 4.3- Base 10 Blocks- Counting On by Ones • Number Talk • String- Counting on by 1’s (Regrouping at 10) • Mini-lesson: • R6-2 • Students use base 10 blocks to create a number (slide) and add ones to the number. Students find the sum of the numbers. (slide) • Students use base ten blocks to count on by ones from a 2 digit number (slide) • Independent Practice • Students use base ten blocks to add ones to a 2 digit number (slide from lesson) • Problem Solving • Students solve a problem using • A bar model and number model to make a plan • Base to blocks to solve the problem • A labeled answer • Homework/Extra practice • Students use base ten blocks add ones to a 2 digit number (slide) • R6-2 revised • EM107 revised

  20. Lesson 4.3: Number Talk: Regroupings 10 ones Into 1 Ten 25+5 42+8 25+5+3 42+8+1 25+8 42+ 9

  21. Lesson 4.3: I Can Add Ones to 2 Digit Numbers With Base 10 Blocks

  22. Lesson 4.3 I Can Add Ones to 2 Digit Numbers With Base 10 Blocks

  23. Lesson 4.3: Problem Solving- Adding Ones With Base 10 Blocks • Mary is 16 years old. Her sister Sue is 6 years older. How old is Sue? Number Model: _____+______=_______ Answer: _____________________ Units

  24. Lesson 4.3: Problem Solving- Adding Ones With Base 10 Blocks Number Model: _____+______=_______ Answer: _____________________ Units

  25. Lesson 4.4- Base 10 Blocks- Counting On by Tens and Ones • Number Talk • String- Counting on by 10’s and 1’s • Mini-lesson: • Students use base 10 blocks to create a number (slide) and add tens and ones to the number. Students find the sum of the numbers. (slide) • Students use base ten blocks to count on by ones from a 2 digit number (slide) • Independent Practice • Students use base ten blocks to add tens ones to a 2 digit number (slide from lesson) • Problem Solving • Students solve a problem using • A bar model and number model to make a plan • Base to blocks to solve the problem • A labeled answer • Homework • Students use base ten blocksaddt tens and ones to a 2 digit number (slide)

  26. Lesson 4.4:Number Talk: Place Value Jumping Adding Tens and Ones 40+20 20+70 6+5 7+2 46+25 27+72

  27. Lesson 4.4: ICan Add Tens Ones to 2 Digit Numbers With Base 10 Blocks

  28. Lesson 4.4: I Can Add Tens Ones to 2 Digit Numbers With Base 10 Blocks

  29. Lesson 4.4:Problem Solving- Adding Tens and Ones With Base 10 Blocks • There were 47 girls and 42 boys in second grade. How many students are there in all? Number Model: _____+______=_______ Answer: _____________________ Units

  30. Lesson 4.4: Problem Solving- Adding Tens and Ones With Base 10 Blocks Number Model: _____+______=_______ Answer: _____________________ Units

  31. Number Grids

  32. Lesson 4.5: Number Grids- Counting On by Tens • Number Talk • String- Counting on by 10’s • Mini-lesson: • R6-5 • Students find 10’s pattern on number grid by filling in missing numbers • Students use number grids to start at a number and add a multiple of 10 by counting on by 10’s. Students find the sum of the numbers. (slide) • Independent Practice • Students use number grids to start at a number and add a multiple of 10 by counting on by 10’s. Students find the sum of the numbers. (slide) • Problem Solving • Students solve a problem using • A bar model and number model to make a plan • Number Grids to solve the problem • A labeled answer • Homework/Extra Practice • P6-5 • Students use number grids to add multiples of 10 to a 2 digit number (slide)

  33. Lesson 4.5: Number Talk: Place Value Jumping 61+10 19+10 61+20 19+20 61+30 19+30

  34. Lesson 4.5: I Can Count Tens On The Number Grid

  35. Lesson 4.5 I Can Use a Number Grid to Add Tens To a 2 Digit Number

  36. Lesson 4.5: I Can Use a Number Grid to Add Tens To a 2 Digit Number

  37. Lesson 4.5: Problem Solving- Adding Tens With Number Grids • Lisa is saving money for a new toy had $42 in her piggy bank. She earned $30 babysitting. How much does she have now? Number Model: _____+______=_______ Answer: _____________________ Units

  38. Lesson 4.5: Problem Solving- Adding Tens With Number Grids Number Model: _____+______=_______ Answer: _____________________ Units

  39. Lesson 4.5: Homework I Can Use a Number Grid to Add Tens To a 2 Digit Number

  40. Lesson 4.6: Number Grids- Counting On by Ones • Number Talk • String- Counting on by ones and regrouping 10 ones into 1 ten • Mini-lesson: • Students use number grids to start at a number and add 1’s by counting on (using 10 ‘s as a landmark) . Students find the sum of the numbers. (slide) • Independent Practice • Students use number grids to start at a number and add 1’s by counting on(using 10 ‘s as a landmark) . Students find the sum of the numbers. (slide) • Problem Solving • Students solve a problem using • A bar model and number model to make a plan • Number Grids to solve the problem • A labeled answer • Homework/Extra practice • Students use number grids to start at a number and add1’s by counting on. (using 10 ‘s as a landmark) . Students find the sum of the numbers. (slide)

  41. Lesson 4.6-Number Talk: Regroupings 10 ones Into 1 Ten 25+5 56+4 25+5+3 56+4+3 25+8 56+7

  42. Lesson 4.6: I Can Use a Number Grid to Add Ones To a 2 Digit Number

  43. Lesson 4.6: I Can Use a Number Grid to Add Ones To a 2 Digit Number

  44. Lesson 4.6: Problem Solving- Adding Ones With Number Grids • Jennifer read 18 pages so far. She has 9 more pages to read. How many pages will she read altogether? Number Model: _____+______=_______ Answer: _____________________ Units

  45. Lesson 4.6 Problem Solving- Adding Ones With Number Grids Number Model: _____+______=_______ Answer: _____________________ Units

  46. Homework: Leson 4.6: I Can Use a Number Grid to Add Ones To a 2 Digit Number

  47. Lesson 4.7: Number Grids- Counting On by Tens and Ones • Number Talk • String- Counting on by tens and ones • Mini-lesson: • EM83 • R6-4 • Students use number grids to start at a number and count on by tens and ones to find the sum of 2 2 digit numbers (slide) • Independent Practice • Students use number grids to start at a number and count on by tens and ones to find the sum of 2 2 digit numbers (slide) • Problem Solving • Students solve a problem using • A bar model and number model to make a plan • Number Grids to solve the problem • A labeled answer • Homework/Extra practice • P6-4 • Students use number grids to start at a number and count on by tens and ones to find the sum of 2 2 digit numbers (slide)

  48. Lesson 4.7: Number Talk: Place Value Jumping Adding Tens and Ones 32+30 17+50 62+5 67+5 32+35 17+55

  49. Lesson 4.7: I Can Use Number Grids to Understand and Represent Addition of 2 Digit Numbers. 25+32

  50. Lesson 4.7: I Can Use Number Grids to Understand and Represent Addition of 2 Digit Numbers.

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