This question tests 2nd grade understanding of partitioning rectangles into equal squares and counting total (CCSS 2.G.A.2: Partition a rectangle into rows and columns of same-size squares and count to find the total number). A rectangle can be divided into equal squares by drawing rows (horizontal lines) and columns (vertical lines). Rows go across; columns go up and down. All the squares must be the same size. In this problem, the rectangle has 3 rows of 4 squares each. To find the total squares, students can count one-by-one, count by rows (add the number in each row), or multiply rows × columns. Choice A is correct because 4+4+4 shows adding the 4 squares in each of the 3 rows, giving the total of 12 squares. This correctly represents repeated addition for the total squares in the rectangle. Choice C represents adding rows + columns (3+4=7) instead of repeated addition of squares per row. This error typically happens when students confuse the dimensions with the counting method. To help students: Use hands-on materials like square tiles or graph paper. Physically build rectangles with tiles and count together. Teach rows as "going across" and columns as "going up and down". Show counting by rows: count squares in first row (4), recognize each row has same number (4), add rows (4+4+4=12). Connect to repeated addition (4+4+4) and early multiplication (3 rows × 4 per row = 12). Have students color or mark each square as they count to avoid skipping or double-counting. Practice drawing partitions on blank rectangles using ruler for equal squares.

This question tests 2nd grade understanding of partitioning rectangles into equal squares and counting total (CCSS 2.G.A.2: Partition a rectangle into rows and columns of same-size squares and count to find the total number). A rectangle can be divided into equal squares by drawing rows (horizontal lines) and columns (vertical lines). Rows go across; columns go up and down. All the squares must be the same size. In this problem, there are 3 rows with 4 squares in each. To find the total squares, students can count one-by-one, count by rows (add the number in each row), or multiply rows × columns. Choice D is correct because there are 3 rows with 4 squares in each row, so 4+4+4=12 squares, or 3×4=12 squares, or counting all squares one by one gives 12 total. This correctly counts all the equal squares in the rectangle. Choice A represents adding rows + columns (3+4=7) instead of multiplying (3×4=12). This error typically happens when students use wrong operation. To help students: Use hands-on materials like square tiles or graph paper. Physically build rectangles with tiles and count together. Teach rows as "going across" and columns as "going up and down". Show counting by rows: count squares in first row (4), recognize each row has same number (4), add rows (4+4+4=12). Connect to repeated addition (4+4+4) and early multiplication (3 rows × 4 per row = 12). Have students color or mark each square as they count to avoid skipping or double-counting. Practice drawing partitions on blank rectangles using ruler for equal squares. Watch for: counting grid lines instead of squares, counting corners/intersection points instead of squares, stopping count early, confusing row count with total count, drawing unequal squares (rectangles instead).

This question tests 2nd grade understanding of partitioning rectangles into equal squares and counting total (CCSS 2.G.A.2: Partition a rectangle into rows and columns of same-size squares and count to find the total number). A rectangle can be divided into equal squares by drawing rows (horizontal lines) and columns (vertical lines). Rows go across; columns go up and down. All the squares must be the same size. In this problem, the rectangle has 3 rows of 4 squares each. To find the total squares, students can count one-by-one, count by rows (add the number in each row), or multiply rows × columns. Choice A is correct because 4+4+4 shows adding the 4 squares in each of the 3 rows, giving the total of 12 squares. This correctly represents repeated addition for the total squares in the rectangle. Choice C represents adding rows + columns (3+4=7) instead of repeated addition of squares per row. This error typically happens when students confuse the dimensions with the counting method. To help students: Use hands-on materials like square tiles or graph paper. Physically build rectangles with tiles and count together. Teach rows as "going across" and columns as "going up and down". Show counting by rows: count squares in first row (4), recognize each row has same number (4), add rows (4+4+4=12). Connect to repeated addition (4+4+4) and early multiplication (3 rows × 4 per row = 12). Have students color or mark each square as they count to avoid skipping or double-counting. Practice drawing partitions on blank rectangles using ruler for equal squares.