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> Addition and Subtraction
Introduction to Addition
Watch the tutorials and practice with the different lessons that we give you!
First additions
PRACTICE EXERCISES »
1
Introduction to Addition
First additions
Addition tables up to 3
Addition tables up to 7
Addition tables up to 10
Adding 3 digits horizontally
Adding Tens and Units
Adding Tens to Tens or Hundreds
Adding round Tens and inexact Tens
Adding inexact Tens and Units
Adding hundreds, exact tens, and units
Adding inexact hundreds and exact hundreds
Adding inexact hundreds and units
Adding inexact hundreds and exact tens
2
Introduction to Subtraction
First subtractions
Subtraction tables up to 3
Subtraction tables up to 7
Subtraction tables up to 10
Tens and hundreds minus tens
Subtracting tens from inexact tens
Subtracting units from inexact tens
Problems with minuends less than 100 with the result of an exact ten
Problems with minuends less than 100 and with the result of a unit
Inexact hundreds minus exact hundreds
Subtracting units from inexact hundreds
Problems using minuends greater than 100 with the result of a hundred
Problems using minuends greater than 100 with the result of a ten
Subtracting Ten from inexact Hundreds
Problems with minuends more than 100 and with the result of a unit
3
Column Addition
Vertical addition without carrying
Vertical addition with carrying up to 1000
Vertical addition with carrying up to 10000
4
Column Subtraction
Vertical subtraction without carrying
Vertical subtraction with carrying up to 1000
Vertical subtraction with carrying up to 10000
5
Addition and Subtraction
Relationship of addition with subtraction
Relationship of subtraction with addition
6
Introduction to Addition and Subtraction with the
Rekenrek
Addition (adding) problems with the
rekenrek
Horizontal subtraction, up to 10, with the
rekenrek
Addition (comparing) problems with the
rekenrek
Addition (matching) problems with the
rekenrek
Subtraction (removing) problems with the
rekenrek
Horizontal subtraction, up to 10, using the
rekenrek
Subtraction (comparing) problems with the
rekenrek
Subtraction (matching) problems with the
rekenrek
7
Addition Strategies
Break down the two numbers
Break down one of the numbers
Break down to reach an exact ten
Adding 8 and 9
Adding 11 and 12
Adding two consecutive numbers
Adding numbers that are two numbers apart
8
Subtraction Strategies
Breaking down two numbers
Breaking down a number
Breaking down to reach an exact ten
Breaking down the subtrahend
Breaking down the minuend
Finding the solution to a subtraction using addition
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