Eureka Math Parent Tips
Second Grade Module 5
This document is being produced for the purpose
of giving parents and students in Calcasieu
Parish a better understanding of the math
concepts being taught.
Addition and Subtraction Within
1,000 with Word Problems to 100
In Module 5, students build upon their
mastery of renaming place value units and
extend their work with conceptual
understanding of the addition and
subtraction algorithms to numbers within
1,000, always with the option of modeling
with materials or drawings.
Louisiana Standards:
- Add and subtract within 1000, 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. Understand that in adding or subtracting three-digit
numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes
it is necessary to compose or decompose tens or hundreds.
- Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given
number 100–900.
- Explain why addition and subtraction strategies work, using place value and the properties of operations.
(Explanations may be supported by drawings or objects.)
Words to Know…
Associative property The order of adding numbers will
not change the sum (answer).
Arrow Way
Tape Diagram
RDW (Read, Draw, Write)
Mental Math
Chip Model
Place Value
Place Value Chart
Bundle
Unbundle
Algorithm
Regroup
Rename
Compensation
Change
Vertical Method
Number Disks
Second Grade Module 5
Students will add and subtract
multiples of 100 by counting on by
hundreds. Students will use different
strategies to do this.
They apply the use of number bonds to
decompose larger numbers, just as they
did with numbers within 100.
Second graders continue to add and subtract multiples of 100 using different strategies.
RDW (Read, Draw, Write) –
Read the problem, draw a picture and
write an equation/complete sentence
with the answer.
Students will subtract with two-digit numbers and check with addition. Then students move
on to three-digit numbers. Students will determine if they will use a tape diagram, number
bond or arrow way. Students will see how the Associative Property is relevant.
They will then have the
opportunity to solidify
their new skill by solving
problems and sharing
their solution strategies.
Second Grade Module 5
Students relate each action on the
place value chart to the written
vertical method for addition.
Second graders unbundle a ten to make
17 ones. Then, they unbundle a hundred
to make 13 tens and are now able to
subtract.
Students transition to making math
drawings, thus completing the move from
concrete to pictorial representations.
Students will determine which strategy to apply to a variety of addition and
subtraction problems, including number bond problems and problems with
the unknown in all positions. (Example: 200 + ____ = 342 or ____ – 53 = 400)
Then, students will solve and explain their chosen methods.
Possible Solution Strategies:
Second Grade Module 5