Long Division Calculator › 21 divided by 2
21 Divided by 2
21 ÷ 2 = 10.5
| Exact decimal | 10.5 |
| Whole-number quotient | 10 |
| Remainder | 1 |
| As a fraction | 21/2 |
Check: 10 × 2 + 1 = 21.
Long division, step by step
Working through each digit of 21 from left to right, dividing by 2 and carrying the remainder:
| Bring down | Divide | Digit | Left over |
| 2 | 2 ÷ 2 | 1 | 0 |
| 1 | 1 ÷ 2 | 0 | 1 |
Reading the digit column top to bottom gives the quotient 10 with 1 left over.
A terminating decimal
21 ÷ 2 stops after 1 decimal place: it equals exactly 10.5. The division is clean because 2's only prime factors are 2 and 5.
Divide 21 by other numbers
21 ÷ 3 · 21 ÷ 4 · 21 ÷ 5 · 21 ÷ 6 · 21 ÷ 7 · 21 ÷ 8 · 21 ÷ 9 · 21 ÷ 10 · 21 ÷ 11 · 21 ÷ 12
Nearby divisions by 2
Frequently asked questions
What is 21 divided by 2?
21 ÷ 2 = 10.5. As a whole number the quotient is 10 with a remainder of 1.
Is 21 ÷ 2 a terminating or repeating decimal?
It terminates: 21 ÷ 2 = 10.5 exactly, with 1 decimal place.
Is 21 divisible by 2?
No. The nearest multiples of 2 are 20 (10 × 2) and 22 (11 × 2), so 21 leaves a remainder of 1.