Adding three-digit numbers

1.1   Place value blocks

1.2   Place value tables

1.3   Number and word form of a number

1.4   Going from word form to expanded form

1.5   Regrouping whole numbers

1.6   Rounding to the nearest 10

1.7   Rounding to the nearest 100

1.8   Examples rounding to the nearest 10 and 100

1.9   Breaking apart 3-digit addition problems

1.10   Addition using groups of 10 and 100

1.11   Subtraction by breaking apart

1.12   Methods for subracting 3 digit numbers

1.14   Adding: why carrying works

1.15   Adding three digit numbers with regrouping

1.16   Subtracting: three digit numbers and basic regrouping

1.17   Subtracting: three digit numbers and regrouping

1.18   Subtracting: Regrouping from zero

1.19   Introduction to multiplication

1.20   Multiplication as repeated addition

1.21   Multiplication on the number line

1.22   Intro to multiplication

1.23   More on the concept of multiplication

1.24   Multiplication as groups of objects

1.25   Order when multiplying commutative property of multiplication

1.26   Associative property of multiplication

1.27   Order doesn_t matter when purely multiplying

1.28   Using the distributive property when multiplying

1.29   Properties and patterns for multiplication

1.30   Division as equal groupings

1.31   Visualizing division with arrays

1.32   Examples relating multiplication to division

1.33   Fraction basics

1.34   Cutting shapes into equal parts

1.35   Fractions in context

1.36   Numerator and denominator of a fraction

1.37   More than one equal section

1.38   Recognizing fractions greater than 1

1.39   Relating number lines to fraction bars

1.40   Fractions on a number line

1.41   Fractions on the number line widget

1.42   Finding 1 on the number line

1.43   Fractions greater than 1 on the number line

1.44   Different ways to represent 1 as a fraction

1.45   Relating fractions to 1

1.46   Whole numbers as fractions

1.47   Writing whole numbers as fractions

1.48   Comparing fractions with greater than and less than symbols

1.49   Comparing fractions visually and on number line

1.50   Comparing fractions with the same denominator

1.51   Comparing unit fractions

1.52   Comparing fractions with same numerator

1.53   Equivalent fractions with visuals

1.54   Equivalent fraction models

1.55   Equivalent fractions visually and on number line

1.56   Generating equivalent fractions

1.57   Introduction to types of quadrilaterals

1.58   Rectangle area as product of dimensions same as counting unit squares

1.59   Transitioning from counting to multiplying to find area

1.60   Rectangle area as product of dimensions same as counting unit squares

1.61   Finding missing side when given area

1.62   Introduction to perimeter

1.63   Perimeter of a shape

1.64   Finding perimeter when a side length is missing

1.65   Finding missing side length when given perimeter