Original: a castle built with 10 blocks. New: same 10 blocks make a house. Which is true?
- The house was made with different blocks than the castle.
- The same 10 blocks were rearranged to make a house. (correct answer)
- Five blocks were taken away before making the house.
- The blocks changed colors to make the house.
Explanation: This question assesses the skill 2-PS1-3: Reassembling same pieces to make new object—understanding that a set of pieces can be rearranged to create different objects. Objects made of pieces can be taken apart and rearranged to make something new, with the important idea being the same pieces in a different arrangement, without adding or removing any—we just move them to different positions, showing that pieces can be used in many ways. The original object was a castle made of 10 blocks, and the same 10 blocks were taken apart and rearranged to make a house; counting shows the castle had 10 pieces and the house also has 10 pieces—the same number and same pieces, but with a changed arrangement and shape. The correct answer is B because it correctly identifies that the same 10 blocks were used in both objects, just rearranged with no pieces added or taken away; students who observe carefully can see the same count and same blocks in both. Distractor A is incorrect because it claims the house used different blocks, which is wrong as they are the same—this error happens when students don't recognize the transformation or focus only on the final appearance. To help students understand reassembly, have them physically build, take apart, and rebuild with the same pieces like blocks, counting at each stage: 'How many blocks in the castle? Now take apart. How many? Now make a house. How many?'—it's the same number! Use 'Same/Different' charts to note what's same (pieces, number) versus different (shape, arrangement), and emphasize that matter doesn't disappear or appear—it just moves.