Curriculum Library

Grade 1 Unit 4: Place Value Addition and Subtraction

Key Concept: Place value can be used as a strategy for addition and subtraction.

Lesson Sequences

1.4-1-1 Double Fact Strategies to 18  |
View Lesson Opener Discover & Discuss (5-10 min)
View Guided Lesson Students use double facts within 18 to efficiently determine the sums of double plus one facts.  (12-20 min)
View Lesson Closer Math Musings (5-8 min)
1.4-1-2 Decompose to Subtract Within 20  |
View Teacher-Facilitated Lesson Students apply their understanding of decomposition to make a ten when subtracting within 20. (35-45 min)
1.4-1-3 Add Units of Ones and Tens  |
View Lesson Opener Discover & Discuss (5-10 min)
View Guided Lesson Students apply their understanding of units in order to add like units. (12-20 min)
View Lesson Closer Math Musings (5-8 min)
1.4-1-4 Subtract Units of Ones and Tens  |
View Lesson Opener Discover & Discuss (5-10 min)
View Guided Lesson Students apply their understanding of units in order to subtract like units. (12-20 min)
View Lesson Closer Math Musings (5-8 min)
1.4-1-5 Relate Addition and Subtraction with Number Bonds  |
View Teacher-Facilitated Lesson Students begin to understand the relationship between addition and subtraction using a number bond representation.  (35-45 min)
Key Concept: Addition and subtraction can be used to solve join, separate, part-part-whole and comparison word problems.

Lesson Sequences

1.4-2-1 Join and Separate Word Problems: All Unknowns  |
Lesson Plan
View Teacher-Facilitated Lesson Students solve join and separate word problems with unknowns in various positions.   (35-45 min)
1.4-2-2 Part-Part-Whole Word Problems: All Unknowns  |
Lesson Plan
View Lesson Opener Discover & Discuss (5-10 min)
View Guided Lesson Students solve part-part-whole word problems with unknowns in various positions. (12-20 min)
View Lesson Closer Math Musings (5-8 min)
1.4-2-3 Comparison Word Problems: Difference Unknown  |
Lesson Plan
View Teacher-Facilitated Lesson Students solve comparison word problems where the difference is unknown.  (35-45 min)
Key Concept: When comparing two-digit quantities one compares tens to tens, ones to ones, and compares the tens place value first.

Lesson Sequences

1.4-3-1 Compare Quantities to 99  |
Lesson Plan
View Teacher-Facilitated Lesson Students use the phrases more than, fewer than, and equal to in order to compare groups of objects to 99. (35-45 min)
1.4-3-2 Compare Quantities to 99 with Symbols  |
Lesson Plan
View Teacher-Facilitated Lesson Students use greater than, less than, and equal to symbols to compare groups of objects to 99.  (35-45 min)
1.4-3-3 Compare Quantities to 99: How Many More  |
Lesson Plan
View Teacher-Facilitated Lesson Students compare quantities and determine how much larger or smaller one group is than the other.  (35-45 min)
1.4-3-4 Compare Numerals to 99: Make a Model  |
Lesson Plan
View Teacher-Facilitated Lesson Students build upon their understanding of comparing groups of objects to 99 in order to use models to compare numerals to 99. (35-45 min)
1.4-3-5 Compare Numerals to 99  |
Lesson Plan
View Teacher-Facilitated Lesson Students apply their understanding of place value to compare numerals to 99.  (35-45 min)
Key Concept: Ones can be added to ones and tens can be added to tens.

Lesson Sequences

1.4-4-1 Add Ones or Tens to Two-Digit Numbers  |
Lesson Plan
View Lesson Opener Hands-On (5-10 min)
View Guided Lesson Students apply their understanding of units in order to add like units within two-digit numbers.  (12-20 min)
View Lesson Closer Math Musings (5-8 min)
1.4-4-2 Add Multiples of 10 to Two-Digit Numbers  |
Lesson Plan
View Lesson Opener Discover & Discuss (5-10 min)
View Guided Lesson Students add multiples of ten to two-digit numbers.  (12-20 min)
View Lesson Closer Math Musings (5-8 min)
1.4-4-3 Subtract Ones or Tens from Two-Digit Numbers  |
Lesson Plan
View Lesson Opener Hands-On (5-10 min)
View Guided Lesson Students apply their understanding of units in order to subtract like units within two-digit numbers.  (12-20 min)
View Lesson Closer Math Musings (5-8 min)
1.4-4-4 Subtract Multiples of 10 from Two-Digit Numbers  |
Lesson Plan
View Lesson Opener Discover & Discuss (5-10 min)
View Guided Lesson Students subtract multiples of ten from two-digit numbers.  (12-20 min)
View Lesson Closer Math Musings (5-8 min)
1.4-4-5 Add/Subtract Multiples of 10 from Decade Numbers  |
Lesson Plan
View Lesson Opener Discover & Discuss (5-10 min)
View Guided Lesson Students add and subtract multiples of ten from decade numbers.  (12-20 min)
View Lesson Closer Math Musings (5-8 min)