Triangle Attributes and Composing Shapes
2D shape detective sheet for 1st grade: triangle rules, shapes that compose a rectangle, a two-trapezoid hexagon, and pizza fourths. Covers 1.G.1 to 1.G.3.
1st Grade Geometry Worksheets
1.G geometry: composing two-dimensional shapes to create composite shapes and building new shapes from them.
1st Grade Math6 worksheets
Geometry worksheets to download
2D Shape Attributes Check
Defining attributes check for 1st grade geometry: pick the three true triangle rules, count sides and vertices, draw a shape with 4 square corners. 1.G.1.
Halves and Fourths Shape Sort
Halves and fourths shape sort for 1st grade: six partitioned shapes to place in 2-share and 4-share columns, plus a which-share-is-smaller check. 1.G.3.
Composite Shapes Matching
Composite shapes matching for 1st grade: shape recipes like 1 triangle and 1 square, a rocket to decompose, and joining half-circles into a circle. 1.G.2.
Shapes and Equal Shares Exit Slip
Equal shares exit slip for 1st grade: tick the true halves, name fourths on a partitioned rectangle, draw the lines, compare half to fourth. A fast 1.G.3 check.
3D Shapes Labelling
3D Shapes Labelling for 1st grade: name cone, cube, cylinder and sphere, match a soup can and a soccer ball to solids, solve riddles. 1.G.1, 1.G.2.
Curriculum objectives covered
1.G.1
“Distinguish between defining attributes (e.g., triangles are closed and three-sided) versus non-defining attributes (e.g., color, orientation, overall size); build and draw shapes to possess defining attributes.”
1.G.2
“Compose two-dimensional shapes (rectangles, squares, trapezoids, triangles, half-circles, and quarter-circles) or three-dimensional shapes (cubes, right rectangular prisms, right circular cones, and right circular cylinders) to create a composite shape, and compose new shapes from the composite shape.”
1.G.3
“Partition circles and rectangles into two and four equal shares, describe the shares using the words halves, fourths, and quarters, and use the phrases half of, fourth of, and quarter of. Describe the whole as two of, or four of the shares. Understand for these examples that decomposing into more equal shares creates smaller shares.”
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Addition and Subtraction
1.OA problem solving: using addition and subtraction within 20 to solve word problems in a range of situations.
Place Value
1.NBT place value: understanding that the two digits of a two-digit number represent amounts of tens and ones.
Measurement and Data
1.MD measurement: ordering three objects by length and comparing the lengths of two objects indirectly using a third object.
Number Patterns
Further 1.OA work: determining the unknown whole number in addition and subtraction equations to build equation sense.