Curriculum / Math / 2nd Grade / Unit 5: Adding and Subtracting Within 1,000 / Lesson 1
Math
Unit 5
2nd Grade
Lesson 1 of 25
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Lesson Notes
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Mentally add 10 and 100 to numbers within 1,000.
I can mentally add 10 and 100 to numbers within 1,000.
The core standards covered in this lesson
2.NBT.B.8 — Mentally add 10 or 100 to a given number 100—900, and mentally subtract 10 or 100 from a given number 100—900.
The foundational standards covered in this lesson
1.NBT.B.2 — Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:
2.NBT.A.1 — Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0 tens, and 6 ones. Understand the following as special cases:
2.NBT.A.2 — Count within 1000; skip-count by 5s, 10s, and 100s.
The essential concepts students need to demonstrate or understand to achieve the lesson objective
5-10 minutes
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Suggestions for teachers to help them teach this lesson
Students will need to fluently add 10 or 100 to three-digit numbers to 1,000 which requires that students have a firm grasp of the count sequence to 1,000. Using completed hundreds charts to 1,000 from Unit 4 may be a helpful resource for students to make a connection between three-digit numbers and adding a ten or a hundred.
Tasks designed to teach criteria for success of the lesson, and guidance to help draw out student understanding
15-25 minutes
Some of the numbers from the hundreds chart are missing. Find the missing numbers based on what we know.
a.
b.
c.
d.
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Build the number 184 with base ten blocks.
a. What number is made if we add 100?
b. What number is made if we add another 100 to the new number that was made?
c. In parts a and b, what digit changes? What digit(s) stay the same?
d. Solve the following and think about what digits stay the same and which change.
Each jump between each tick mark on the number line counts by the same value. Find the missing number in each number line. Write the equation you used to find the missing number.
a. _____ + _____ = _____
b. _____ + _____ = _____
c. _____ + _____ = _____
d. _____ + _____ = _____
e. _____ + _____ = _____
15-20 minutes
A task that represents the peak thinking of the lesson - mastery will indicate whether or not objective was achieved
Use mental math to find the missing numbers.
a. 10 + 545 = _____
b. 190 + 10 = _____
c. 125 + 100 = _____
d. 680 + 100 = _____
e. 370 + 10 = _____
Daily Word Problems, Warm Ups, and Center Activities are aligned to the content of the unit but not necessarily to the lesson objective, therefore feel free to use them anytime during your school day.
Next
Add multiples of 10 and 100 to numbers within 1,000.
Topic A: Adding with Mental Strategies
Standards
2.NBT.B.8
2.NBT.B.72.NBT.B.8
Use the associative property to make a multiple of 100 or multiple of 10 to add.
2.NBT.B.7
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Topic B: Adding within 1,000
Use concrete manipulatives to add within 1,000.
Use concrete manipulatives to add within 1,000 with up to one composition.
Use concrete manipulatives to add within 1,000 with up to two compositions.
Use place value drawings to add within 1,000 with up to one composition of a new unit.
Use place value drawings to add within 1,000 with up to two compositions of a new unit.
2.NBT.B.6
Use expanded form to add within 1,000.
Relate addition with place value drawings to algorithms in situations with up to two compositions of a new ten or hundred.
Topic C: Subtracting with Mental Strategies
Mentally subtract 10 and 100 from numbers within 1,000.
Subtract multiples of 10 and 100 from numbers within 1,000.
Use constant difference to subtract by subtracting multiples of ten or a hundred.
Topic D: Subtracting within 1,000
Use concrete manipulatives to subtract within 1,000 with no decompositions.
Use concrete manipulatives to subtract within 1,000 with up to one decomposition.
Use concrete manipulatives to subtract within 1,000 with up to two decompositions.
Use place value drawings to subtract within 1,000 with up to one decomposition.
Use place value drawings to subtract within 1,000 with up to two decompositions.
Use expanded form to subtract within 1,000.
Relate subtraction with expanded form to the standard algorithm in situations with up to two decompositions of a ten or hundred.
Topic E: Story Problems and Explaining Addition and Subtracting Thinking
Solve one-step word problems using strategies to solve within 100.
2.NBT.B.52.OA.A.1
Solve two-step word problems using strategies to solve within 100.
Solve addition computations within 1,000 and explain strategies.
2.NBT.B.62.NBT.B.72.NBT.B.9
Solve subtraction computations within 1,000 and explain strategies.
2.NBT.B.72.NBT.B.9
Solve and explain strategies when adding and subtracting within 1,000.
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