Array — 3 × 7 = 21 — free printable diagram

What is 3 × 7?

This array is laid out as 3 rows of 7 dots. Counting every dot gives 21, so 3 × 7 = 21.

Rows

3

Columns

7

Total dots

21

Multiplication

3 × 7 = 21

Division

21 ÷ 3 = 7

• Count the rows, then count how many are in each row: 3 rows of 7 makes 3 × 7 = 21.
• As repeated addition that is 7 added 3 times: 7 + 7 + 7 = 21.
• Turning the array on its side does not change the total, which is the commutative property: 3 × 7 = 7 × 3 = 21.
• The same picture shows the two division facts as well: 21 ÷ 3 = 7 and 21 ÷ 7 = 3.