 Multiplication as equal groups Multiplication on the number line Multiplication as groups of objects Multiplication with arrays Multiplication in contexts Commutative property of multiplication  Multiply by 0 or 1 Multiply by 2 or 4 Multiply by 5 or 10 Multiply by 3 or 6 Distributive property Multiply by 7, 8, or 9 1-digit multiplication  Rounding to nearest 10 or 100  Strategies for adding two and three-digit numbers  Estimate to subtract multi-digit numbers Strategies for subtracting two and three-digit numbers Subtracting with regrouping within 1000 Addition and subtraction missing value problems   Division intro Division in contexts Relating multiplication and division Divide by 1, 2, or 4 Divide by 5 or 10 Divide by 3 or 6 Divide by 7, 8 or 9 1-digit division  Fractions intro Fractions in contexts What fractions mean Fractions on the number line Fractions and whole numbers  Comparing fractions Comparing fractions of different wholes Equivalent fractions  Letters and symbols in multiplication Multiplication and division word problems Associative property of multiplication Multiplying by tens  2-step expressions Estimation word problems One and two-step word problems Patterns in arithmetic    Area introduction Count unit squares to find area Area formula intuition Multiply to find area Area and the distributive property Decompose figures to find area  Perimeter Perimeter of polygons with missing side lengths Perimeter word problems Comparing area and perimeter 