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Mental Math-Creating an Easier Problem
Relationship between Addition and Subtraction
Math Strategy of Making Doubles
Using a Number Line to Add or Subtract
Using 100s Board to Add or Subtract
Pairing objects to determine if a number is even or odd
Representing a Number with a Place Value Drawing
Writing a Number in Expanded Form
Place value strategy for 2-digit addition
Decomposing a number to make a ten for 2-digit addition
2-digit addition using a number line
2-digit addition using a hundreds board
Expanded method for 2-digit addition
Show all totals method for 2-digit addition
Place value strategy for 2-digit subtraction
2-digit subtraction using a number line
2-digit subtraction using a hundreds board
Math Expanded method for 2-digit subtraction
Explain addition using place value
Add up to 4 Two-digit Numbers using Place Value
Explain subtraction as an unknown addend
Explain subtraction using place value3-digit subtraction using base ten place value blocks
3-digit subtraction with proof drawings