3rd Grade Math
To start the year will review place value (ones, tens, hundreds) and learn up to the thousands place. This will include adding and subtraction, in isolation and through word problems. We will begin learning how to solve word problems using multiple strategies.
Rounding
Many third graders find rounding numbers difficult. Just remember: If you are rounding to the TENS, look at the ones. If you are rounding to the HUNDREDS, look at the tens.
Useful tools: draw a number line of the numbers in the tens or hundreds place closest to that number.
Watch this ROUNDING VIDEO to help you!
Useful tools: draw a number line of the numbers in the tens or hundreds place closest to that number.
Watch this ROUNDING VIDEO to help you!
Geometry
Important Vocabulary:
Polygon- closed shaped with lines (no curves)
Quadrilateral- a 4-sided shape
Hexagon- a 6-sided shape
Octagon- an 8 sided shape
Triangle- a 3-sided shape
Types of Quadrilaterals:
Parallelogram: has 2 sets of parallel lines and no right angles
Rhombus: has equal length sides, 2 sets of parallel lines, no right angles (when extended, the lines intersect)
Rectangle: 2 sets of parallel lines, opposite sides are equal length, 4 right angles
Square: 2 sets of a parallel lines, equal length sides, 4 right angles
*A square can be a rectangle, but a rectangle cannot be a square! (Think about the sides)
Trapezoid: 1 set of parallel lines and no right angles
Intersecting lines- form obtuse or acute angles when the cross
parallel lines- lines that never cross
perpendicular lines- lines that form right angles when they cross
Polygon- closed shaped with lines (no curves)
Quadrilateral- a 4-sided shape
Hexagon- a 6-sided shape
Octagon- an 8 sided shape
Triangle- a 3-sided shape
Types of Quadrilaterals:
Parallelogram: has 2 sets of parallel lines and no right angles
Rhombus: has equal length sides, 2 sets of parallel lines, no right angles (when extended, the lines intersect)
Rectangle: 2 sets of parallel lines, opposite sides are equal length, 4 right angles
Square: 2 sets of a parallel lines, equal length sides, 4 right angles
*A square can be a rectangle, but a rectangle cannot be a square! (Think about the sides)
Trapezoid: 1 set of parallel lines and no right angles
Intersecting lines- form obtuse or acute angles when the cross
parallel lines- lines that never cross
perpendicular lines- lines that form right angles when they cross
Multiplication
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