1 Times Table

1 times table at a glance

1 × 10

10

1 × 12

12

1 × 1 (square)

1

1 × 20

20

Each step adds

1

Sum of ×1 to ×20

210

The 1 times table from 1 to 20

1 × 1 through 1 × 9 belong to the core facts — every product of two one-digit numbers — that US standards expect students to know from memory by the end of third grade. Each row also gives the matching division fact.

Patterns in the 1 times table

• Last digits. The ones digits of 1 × 1 to 1 × 10 are 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 — all ten digits appear once before the pattern repeats, because 1 shares no factor with 10.
• Odd and even. 1 is odd, so the answers alternate odd, even, odd, even — odd times odd is odd, odd times even is even.
• Digit sums. Reduce each answer to a single digit (1 × 1 to 1 × 9 give 1, 2, 3, 4, 5, 6, 7, 8, 9) and all nine values appear before repeating.

A shortcut for multiplying by 1

Multiplying by 1 leaves a number unchanged — the identity property. It is the one table you already know.

Practice: 1 times table questions

1. 1 × 3 = ?
2. 1 × 19 = ?
3. 1 × 4 = ?
4. 1 × 9 = ?
5. 2 × 1 = ?
6. 11 × 1 = ?
7. 1 × ? = 13
8. 1 × ? = 5
9. 17 ÷ 1 = ?
10. Word problem: Each ticket admits 1 person. How many admissions are there in 12 tickets?

For a self-checking quiz with new questions every time, use the practice mode of the multiplication table.

Related to the 1 times table

• 1 × 1 = 1, so the square root of 1 is 1.
• Every answer in this table is a multiple of 1; the multiples calculator lists them past × 20.

Need a different value? Use the Multiplication table, or browse the Times tables 1–25.