Find here many important first grade math concepts taught in first grade.  Teachers, parents, and math tutors can also use them as a guideline to illustrate a math lesson or to teach important skills that kids are supposed to know in first grade math.

 Equal parts or equal sharesThe orange circle has 2 equal parts.The blue circle has 4 equal parts

 ArraysThe first array is made of soccer balls.The array has 2 rows and 3 columns.2 × 3 = 6 ballsThe second array is made of squares.The array has 3 rows and 4 columns.3 × 4 = 12 squares

 QuarterQuarter = one-fourth = 1 of 4 equal parts

 Associative property

 Closed figureAll sides of a closed figure are connected.

 Hour handThe hour hand takes 1 hour to move from a number to the next. Hour or hr = 60 minutes.

 EstimateAn estimate is not the same as an exact answer. We just need a number close to the exact amount. To estimate the number of marbles, we just need to know about how manyPossible answers: 15, 14, or 17

 Commutative propertyWhether 2 is written first or not, the answer to 2 + 1 is still 3

 2-dimensional figures

 Types of clocks

 Cube:A cube has 6 faces, 12 edges and 8 vertices. The cube on the right shows 3 faces with the color red, blue, and orange.

 Multiple of 10

 Counting upStart at 3 and count 2 more to reach 5.

 NumberA number indicates how many or how much. A numeral is used to represent the number of objects. For example, after counting the pencils on the right, we get 4. We use the numeral 4 to represent 4 pencils.

 3-dimensional shapes.3 dimensional shapes are solid shapes that have width, length, and height.

 Make 10

 Minute handThe minute hand takes 5 minutes to move from a number to the next. Minute = seconds.

 DifferentThe two triangles are different, but they have the same shape.

 Counting downStart at 6 and count backward to reach 2.

 Composite shapeThe arrow on the right is a composite shape since it is made from 2 basic shapes ( a triangle and a rectangle)

 Collecting data

 ExpressionAn expression has no equal sign

 Coins1 penny = 1 cent1 nickel = 5 cents1 dime = 10 cents1 quarter  = 25 cents2 dimes + 1 quarter + 3 nickels = 60 cents

 EquationEquation always have an equal sign. The amount on the left side is equal to the amount on the right side.

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1. ### Properties of Congruence

Nov 09, 18 09:40 AM

Learn the three properties of congruence. Examples to illustrate which property.

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