SandHills Regional Education Consortium
Domain: Numbers and Operations in Base Ten
Mathematical Practice(s):
Level of Thinking:
1. Persevere in problem solving.
Apply
2. Reason abstractly and quantitatively.
3. Construct viable arguments and critique the
reasoning of others.
4. Model with mathematics.
5. Use appropriate tools strategically.
6. Attend to precision.
7. Look for and make use of structure.
8. Look for and express regularity in repeated
reasoning.
Grade Specific Standard: 1.NBT.4 Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of
10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction;
relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and
sometimes it is necessary to compose a ten.
Information Technology Standard:
1.SE.1.1 Use technology hardware and software responsibly.
Clarifying Objectives:
Add within 100 using a variety of strategies.
Task Analysis
Vocabulary
Review:
 Construct concrete models or drawings to add within 100, including
add, ones, tens
adding a two-digit number and a one-digit number,
 Use place value strategies to add within 100, including adding a twoInstruct:
digit number and a one-digit number
 Construct concrete models or drawings to add within 100 to add a two- decade, place value, operation, justify
digit number and a multiple of 10
 Use place value strategies to add within 100 to add a two-digit number
and a multiple of 10
 Demonstrate when adding two-digit numbers, it is necessary to add
tens and tens, ones and ones.
 Demonstrate when adding two-digit numbers sometimes it is
necessary to compose a ten (*Students should not be exposed to the
standard algorithm of carrying or borrowing in 1st grade)
Anson County ~ Bladen County ~ Columbus County ~ Cumberland County ~ Ft. Bragg ~ Harnett County ~ Hoke County
Lee County ~ Montgomery County ~ Moore County ~ Richmond County ~ Robeson County ~ Scotland County ~ Whiteville City
Copyright (2012) – No portion of this document can be reproduced or used without the express permission of the Executive Director of the SandHills Regional Educational Consortium
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SandHills Regional Education Consortium
Domain: Numbers and Operations in Base Ten
Mathematical Practice(s):
Level of Thinking:
1. Persevere in problem solving.
Apply
2. Reason abstractly and quantitatively.
3. Construct viable arguments and critique the
reasoning of others.
4. Model with mathematics.
5. Use appropriate tools strategically.
6. Attend to precision.
7. Look for and make use of structure.
8. Look for and express regularity in repeated
reasoning
Grade Specific Standard: 1.NBT.4 Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of
10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction;
relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and
sometimes it is necessary to compose a ten.
Information Technology Standard: 1.SE.1.1 Use technology hardware and software responsibly.
Clarifying Objectives: Add within 100 using a variety of strategies.
Task Analysis
Vocabulary
 Relate properties of operations, and/or the relationship between
addition and subtraction to the addition of two two-digit numbers
 Relate modeling strategies for addition to a written form and explain
the reasoning used for adding two two-digit numbers
 Add within 100, including adding a two-digit number and a one-digit
number, and adding a two-digit number and a multiple of 10, using
concrete models or drawings and strategies based on place value,
properties of operations, and/or the relationship between addition
and subtraction; relate the strategy to a written method and explain
the reasoning used. Understand that in adding two-digit numbers,
one adds tens and tens, ones and ones; and sometimes it is
necessary to compose a ten
Time and Sequence
Anson County ~ Bladen County ~ Columbus County ~ Cumberland County ~ Ft. Bragg ~ Harnett County ~ Hoke County
Lee County ~ Montgomery County ~ Moore County ~ Richmond County ~ Robeson County ~ Scotland County ~ Whiteville City
Copyright (2012) – No portion of this document can be reproduced or used without the express permission of the Executive Director of the SandHills Regional Educational Consortium
2 of 3
SandHills Regional Education Consortium
Domain: Numbers and Operations in Base Ten
Mathematical Practice(s):
Level of Thinking:
1. Persevere in problem solving.
Apply
2. Reason abstractly and quantitatively.
3. Construct viable arguments and critique the
reasoning of others.
4. Model with mathematics.
5. Use appropriate tools strategically.
6. Attend to precision.
7. Look for and make use of structure.
8. Look for and express regularity in repeated
reasoning
Grade Specific Standard: 1.NBT.4 Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of
10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction;
relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and
sometimes it is necessary to compose a ten.
Information Technology Standard: 1.SE.1.1 Use technology hardware and software responsibly.
Clarifying Objectives: Add within 100 using a variety of strategies.
Instructional Resources:
 www.k-5mathteachingresources.com
 www.mathwire.com
 www.illuminations.nctm.org
 www.maccs.ncdpi.wikispaces.net
 http://www.crickweb.co.uk/ks1numeracy.html
 http://www.abcya.com/first_grade_computers.htm
 www.fuelthebrain.com
 http://teams.lacoe.edu/documentation/classrooms/linda/linda.html
 http://nrich.maths.org/thismonth/1and2
 https://www.xtramath.org/
 http://www.ode.state.oh.us/GD/Templates/Pages/ODE/ODEDetail.aspx?page=3&TopicRelationID=17
04&ContentID=83475
Notes and Additional Information:
Instructional Tools:
 One Hundreds Chart
http://www.mathwire.com/100board/hb2.html
 One Hundred Twenty Chart
 Number line
 Hundreds Board Puzzles
http://www.mathwire.com/100board/hbpuzzles.pdf
 Ten Frames
 Manipulatives (counters)
 Place Value Blocks / Tens and Ones (T Chart)
 Number Balance/ Equi Beams
Anson County ~ Bladen County ~ Columbus County ~ Cumberland County ~ Ft. Bragg ~ Harnett County ~ Hoke County
Lee County ~ Montgomery County ~ Moore County ~ Richmond County ~ Robeson County ~ Scotland County ~ Whiteville City
Copyright (2012) – No portion of this document can be reproduced or used without the express permission of the Executive Director of the SandHills Regional Educational Consortium
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