Unit 2: Numbers and Operations in Base Ten/ Operations and Algebraic Thinking
Grade Level: 2nd Grade
Subject: Math
Length: 8 weeks (October- December)
​
Topics Covered
​
á´‘ Adding and subtracting one digit numbers from memory, fluently add and subtract within 20 using mental strategies
á´‘ fluently add and subtract within 100 using place value strategies
á´‘ add and subtract within 1000: use place value for two and three digit addition with regrouping and two and three digit subtraction with borrowing
á´‘ add and subtract up to 4-2 digit numbers
á´‘ addition and subtraction within 100 to solve word problems with an unknown in all positions using a symbol for the unknown
á´‘ mentally add or subtract multiples of 10 or 100 from another multiple of 10 or 100
á´‘ explain why addition and subtraction strategies work
á´‘ use addition to find total number of objects arranged in rectangular arrays with up to 5 rows and 5 columns and write an equation to express the total as a sum of equal addends (5+5+5+5+5=25).
​
Standards
​
2.NBT.B.5-9
2.OA.A.1
2.OA.B.2
2.OA.C.4
​
Primary Vocabulary
add
addend
array
associative property of addition
commutative property of addition
making 10
multiple of 10
compose
decompose
difference
digit
equal
equal groups
equation
expression
greater than
less than
number
numeral
number line
one-hundred
ones
tens
place value
quantity
sum
count on
counting up
count back
regroup