21 divided by 10 is 2 with a remainder of 1, or 2.1 as a decimal. In symbols: 21 ÷ 10 = 2.1.
| Form | Answer |
|---|---|
| Quotient and remainder | 2 remainder 1 |
| Decimal | 2.1 |
| Fraction | 21/10 |
| Mixed number | 2 1/10 |
| Percent | 210% |
Ask how many times 10 fits into 21. 10 × 2 = 20, and 10 × 3 = 30 is too big, so 10 goes into 21 exactly 2 times with 21 − 20 = 1 left over.
The remainder 1 is 1/10 of another 10, and 1 ÷ 10 = 0.1. So 21 ÷ 10 = 2 + 0.1 = 2.1.
Multiply back: 2 × 10 + 1 = 20 + 1 = 21. ✓
| Division | Answer |
|---|---|
| 20 ÷ 10 | 2 |
| 22 ÷ 10 | 2 R 2 |
| 21 ÷ 9 | 2 R 3 |
| 21 ÷ 11 | 1 R 10 |
| 19 ÷ 10 | 1 R 9 |
| 23 ÷ 10 | 2 R 3 |
| 42 ÷ 10 | 4 R 2 |
See also: factors of 21.
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