How it works
An array is a set of things in rows and columns.
Count one row, then add it once for every row.
A column is up and down. You get the same total from rows or columns.
Worked examples
A few rows
- 2 rows of 3: ? + ? = ?
- Count one row.
- Add it for every row.
- So the answer is 3, 3, 6.
More rows
- 4 rows of 2: ? + ? + ? + ? = ?
- Count one row.
- Add that row once for every row.
- So the answer is 2, 2, 2, 2, 8.
Columns instead
- 3 columns of 4: ? + ? + ? = ?
- A column goes up and down. Count one column.
- Add it once for every column.
- So the answer is 4, 4, 4, 12.
A taste of the worksheet
These are the first problems of set A. The printable sheet has many more, with an answer key.
- 2 rows of 4: __ + __ = __
- 3 rows of 4: __ + __ + __ = __
- 3 rows of 2: __ + __ + __ = __
- 2 rows of 2: __ + __ = __
- 3 rows of 3: __ + __ + __ = __
Words to know
- array