Rows, columns, and arrays (2nd grade)

Front

What goes up and down from top to bottom?

Back

Columns

Front

What goes across from side to side?

Back

Rows

Front

What is an array?

Back

An arrangement of objects in rows and columns.

Tags

CCSS.3.OA.A.1

Front

How many rows does this array have?

Back

Count the number of horizontal lines.

Tags

CCSS.2.OA.C.4

Front

What is repeated addition?

Back

Adding the same number multiple times, e.g., 3 + 3 + 3 = 9.

Tags

CCSS.2.OA.C.4

Front

If there are 4 rows and 2 columns, how many total items are there?

Back

8 items (4 x 2 = 8).

Tags

CCSS.2.OA.C.4

Front

What is the difference between rows and columns?

Back

Rows go side to side; columns go up and down.

Tags

CCSS.5.G.A.1

Front

Can an array have different numbers of items in each row?

Back

No, all rows must have the same number of items.

Tags

CCSS.3.OA.A.1

Front

What is the repeated addition for 4 + 4 + 4?

Back

3 x 4 = 12.

Tags

CCSS.2.OA.C.3

Front

How do you identify the number of columns in an array?

Back

Count the vertical lines.

Tags

CCSS.2.OA.C.4