This question tests 1st grade shape composition and decomposition (CCSS.1.G.2). Shape composition means putting smaller shapes together to make a new, larger shape. For example, two triangles can be arranged to make a square, or two squares can be put next to each other to make a rectangle. The reverse—decomposition—means dividing a shape into smaller parts. The scenario involves Maya stacking two cubes to build a new 3D shape. Choice C is correct because stacking two cubes creates a taller rectangular prism, like a box shape. Choice B is a common error where students confuse 3D stacking with 2D flat shapes, often because spatial reasoning between dimensions is developing. To help students: Provide physical pattern blocks or shape manipulatives for hands-on exploration; demonstrate multiple compositions with same shapes (2 triangles can make square OR rectangle depending on arrangement); practice both composition (building up) and decomposition (taking apart); use real-world examples like pizza slices or sandwiches cut in half; draw or trace shapes to show combinations.

This question tests 1st grade shape composition and decomposition (CCSS.1.G.2). Shape composition means putting smaller shapes together to make a new, larger shape. For example, two triangles can be arranged to make a square, or two squares can be put next to each other to make a rectangle. The reverse—decomposition—means dividing a shape into smaller parts. The scenario involves Maya stacking two cubes to form a new 3D shape. Choice B is correct because stacking two cubes creates a rectangular prism. Choice D is a common error where students confuse the 3D composite with a 2D square, which happens because spatial reasoning is developing. To help students: Provide physical pattern blocks or shape manipulatives for hands-on exploration; demonstrate multiple compositions with same shapes (2 triangles can make square OR rectangle depending on arrangement); practice both composition (building up) and decomposition (taking apart); use real-world examples like pizza slices or sandwiches cut in half; draw or trace shapes to show combinations.

This question tests 1st grade shape composition and decomposition (CCSS.1.G.2). Shape composition means putting smaller shapes together to make a new, larger shape. For example, two triangles can be arranged to make a square, or two squares can be put next to each other to make a rectangle. The reverse—decomposition—means dividing a shape into smaller parts. The scenario involves Sofia arranging four squares to form a new shape. Choice C is correct because placing four squares in a 2x2 grid creates a larger square. Choice A is a common error where students might arrange them in a line instead of a grid, confusing a rectangle with a square due to developing spatial reasoning. To help students: Provide physical pattern blocks or shape manipulatives for hands-on exploration; demonstrate multiple compositions with same shapes (2 triangles can make square OR rectangle depending on arrangement); practice both composition (building up) and decomposition (taking apart); use real-world examples like pizza slices or sandwiches cut in half; draw or trace shapes to show combinations.

This question tests 1st grade shape composition and decomposition (CCSS.1.G.2). Shape composition means putting smaller shapes together to make a new, larger shape. For example, two triangles can be arranged to make a square, or two squares can be put next to each other to make a rectangle. The reverse—decomposition—means dividing a shape into smaller parts. The scenario involves Emma putting two triangles together to form a new shape. Choice B is correct because two right-angled triangles can be arranged with their hypotenuses together to make a square. Choice A is a common error where students might think of curved shapes instead of straight-sided ones, often because they confuse 2D and 3D properties or lack visualization skills. To help students: Provide physical pattern blocks or shape manipulatives for hands-on exploration; demonstrate multiple compositions with same shapes (2 triangles can make square OR rectangle depending on arrangement); practice both composition (building up) and decomposition (taking apart); use real-world examples like pizza slices or sandwiches cut in half; draw or trace shapes to show combinations.

This question tests 1st grade shape composition and decomposition (CCSS.1.G.2). Shape composition means putting smaller shapes together to make a new, larger shape. For example, two triangles can be arranged to make a square, or two squares can be put next to each other to make a rectangle. The reverse—decomposition—means dividing a shape into smaller parts. The scenario involves Chen putting two half-circles together to form a new shape. Choice B is correct because two half-circles joined along their straight edges create a full circle. Choice D is a common error where students confuse 2D shapes with 3D ones, often because they think of stacking instead of flat composition or lack experience with curved shapes. To help students: Provide physical pattern blocks or shape manipulatives for hands-on exploration; demonstrate multiple compositions with same shapes (2 triangles can make square OR rectangle depending on arrangement); practice both composition (building up) and decomposition (taking apart); use real-world examples like pizza slices or sandwiches cut in half; draw or trace shapes to show combinations.

This question tests 1st grade shape composition and decomposition (CCSS.1.G.2). Shape composition means putting smaller shapes together to make a new, larger shape. For example, two triangles can be arranged to make a square, or two squares can be put next to each other to make a rectangle. The reverse—decomposition—means dividing a shape into smaller parts. The scenario involves Keisha cutting a square into two pieces. Choice B is correct because cutting a square diagonally from corner to corner creates two triangles. Choice C is a common error where students think cutting doesn't change the shape, often because they lack experience with decomposition or confuse cutting with separating. To help students: Provide physical pattern blocks or shape manipulatives for hands-on exploration; demonstrate multiple compositions with same shapes (2 triangles can make square OR rectangle depending on arrangement); practice both composition (building up) and decomposition (taking apart); use real-world examples like pizza slices or sandwiches cut in half; draw or trace shapes to show combinations.

This question tests 1st grade shape composition and decomposition (CCSS.1.G.2). Shape composition means putting smaller shapes together to make a new, larger shape. For example, two triangles can be arranged to make a square, or two squares can be put next to each other to make a rectangle. The reverse—decomposition—means dividing a shape into smaller parts. The scenario involves Yuki putting a rectangle and a half-circle on top to form a composite shape. Choice C is correct because a rectangle with a half-circle on top creates an arch-like shape. Choice D is a common error where students ignore the curved part and see only the rectangle, often because they focus on base shapes without considering additions. To help students: Provide physical pattern blocks or shape manipulatives for hands-on exploration; demonstrate multiple compositions with same shapes (2 triangles can make square OR rectangle depending on arrangement); practice both composition (building up) and decomposition (taking apart); use real-world examples like pizza slices or sandwiches cut in half; draw or trace shapes to show combinations.

This question tests 1st grade shape composition and decomposition (CCSS.1.G.2). Shape composition means putting smaller shapes together to make a new, larger shape. For example, two triangles can be arranged to make a square, or two squares can be put next to each other to make a rectangle. The reverse—decomposition—means dividing a shape into smaller parts. The scenario involves Amir putting four quarter-circles together to form a new shape. Choice A is correct because four quarter-circles joined at their straight edges create a full circle. Choice C is a common error where students might think only two quarters make a half, often because they struggle with fractions of shapes or haven't practiced assembling partial circles. To help students: Provide physical pattern blocks or shape manipulatives for hands-on exploration; demonstrate multiple compositions with same shapes (2 triangles can make square OR rectangle depending on arrangement); practice both composition (building up) and decomposition (taking apart); use real-world examples like pizza slices or sandwiches cut in half; draw or trace shapes to show combinations.

This question tests 1st grade shape composition and decomposition (CCSS.1.G.2). Shape composition means putting smaller shapes together to make a new, larger shape. For example, two triangles can be arranged to make a square, or two squares can be put next to each other to make a rectangle. The reverse—decomposition—means dividing a shape into smaller parts. The scenario involves Carlos putting a square and a triangle on top to form a composite shape. Choice A is correct because a square base with a triangle on top resembles a simple house shape. Choice C is a common error where students mix 2D and 3D shapes, often because they think of blocks instead of flat compositions. To help students: Provide physical pattern blocks or shape manipulatives for hands-on exploration; demonstrate multiple compositions with same shapes (2 triangles can make square OR rectangle depending on arrangement); practice both composition (building up) and decomposition (taking apart); use real-world examples like pizza slices or sandwiches cut in half; draw or trace shapes to show combinations.

This question tests 1st grade shape composition and decomposition (CCSS.1.G.2). Shape composition means putting smaller shapes together to make a new, larger shape. For example, two triangles can be arranged to make a square, or two squares can be put next to each other to make a rectangle. The reverse—decomposition—means dividing a shape into smaller parts. The scenario involves Yuki dividing a circle into four equal pieces. Choice C is correct because cutting a circle into four equal parts creates four quarter-circles. Choice A is a common error where students confuse curved pieces with straight-sided triangles, often from limited experience with circle divisions. To help students: Provide physical pattern blocks or shape manipulatives for hands-on exploration; demonstrate multiple compositions with same shapes (2 triangles can make square OR rectangle depending on arrangement); practice both composition (building up) and decomposition (taking apart); use real-world examples like pizza slices or sandwiches cut in half; draw or trace shapes to show combinations.