**Know if a number is odd or even** is very easy. You just have to divide by two, but if you want to save it, our calculator will give you the result automatically.

Its operation is very simple. All you have to do is enter the number you want to know whether it is **odd or even** and press the calculate button to know the result.

Article sections

## How do you know if a number is odd or even?

To find out if a number is odd or even, you only need to** divide it by two**. If the remainder of that division is zero, that is, the division is exact, then you are dealing with an even number. Otherwise, it is an even number.

Examples:

- Number 4: 4/2 = 2, it is an even number.
- Number 5: 5/2 = 2.5, it is an odd number.

It is clear that figuring out whether a number is odd or even is quite easy and most people already know it just by looking at the last digit of the number and **without the need to make the division** between two.

**Another trick** to know if the number will be odd or even is as follows:

- Pair x Pair = Pair
- Odd x Even = Even
- Odd x Even = Even
- Odd x Odd = Even

Depending on the numbers involved in the multiplication, we will obtain an even result as long as any of the above combinations are present. In all other cases, we will obtain an odd result.

## Is zero odd or even?

**The number zero is considered even** because it is an integer multiple of the number 2, i.e., zero multiplied by two equals zero.

Because of this, the number zero **shares all the properties attributed to even numbers.**

## 1 is odd or even

Another frequent doubt is whether the 1 is odd or even. We anticipate that **one is odd** but to check it, we divide it by 2 and we see that the division is not exact, therefore, it is odd.

1 / 2 = 0,5

If you have doubts with any other number, you can do the above check or use our **online odd/even calculator** to find out for sure.

## When a function is odd or even

If you are doing exercises with functions, you may also have the question of **when a function is even or odd**.

**A function is even when it fulfills** these two premises:

- f(x) = f(-x)
- x and -x belong to the domain of the function

For example, even functions are the absolute value, x^{2}the cos(x). We recommend that you draw them yourself on the coordinate axes to check that the following conditions are met. **conditions for a function to be even**.

When you do, you will see that** the even functions have a symmetry with respect to the y-axis**.

**A function is odd when** complies that:

- f(-x) = -f(x)

When represented on the coordinate axes,** the odd functions have an inverse symmetry with respect to the origin of coordinates**and therefore passes through the point (0,0).

Typical examples of **odd functions** are x, x^{3}, sine(x) or the hyperbolic sine.

## Odd numbers from 1 to 1000

To conclude, we leave you with a table with all the **odd numbers from 1 to 1000**. No doubt, it will be very useful for you to print it so that children can learn when a number is odd or even.

1 | 101 | 201 | 301 | 401 | 501 | 601 | 701 | 801 | 901 |

3 | 103 | 203 | 303 | 403 | 503 | 603 | 703 | 803 | 903 |

5 | 105 | 205 | 305 | 405 | 505 | 605 | 705 | 805 | 905 |

7 | 107 | 207 | 307 | 407 | 507 | 607 | 707 | 807 | 907 |

9 | 109 | 209 | 309 | 409 | 509 | 609 | 709 | 809 | 909 |

11 | 111 | 211 | 311 | 411 | 511 | 611 | 711 | 811 | 911 |

13 | 113 | 213 | 313 | 413 | 513 | 613 | 713 | 813 | 913 |

15 | 115 | 215 | 315 | 415 | 515 | 615 | 715 | 815 | 915 |

17 | 117 | 217 | 317 | 417 | 517 | 617 | 717 | 817 | 917 |

19 | 119 | 219 | 319 | 419 | 519 | 619 | 719 | 819 | 919 |

21 | 121 | 221 | 321 | 421 | 521 | 621 | 721 | 821 | 921 |

23 | 123 | 223 | 323 | 423 | 523 | 623 | 723 | 823 | 923 |

25 | 125 | 225 | 325 | 425 | 525 | 625 | 725 | 825 | 925 |

27 | 127 | 227 | 327 | 427 | 527 | 627 | 727 | 827 | 927 |

29 | 129 | 229 | 329 | 429 | 529 | 629 | 729 | 829 | 929 |

31 | 131 | 231 | 331 | 431 | 531 | 631 | 731 | 831 | 931 |

33 | 133 | 233 | 333 | 433 | 533 | 633 | 733 | 833 | 933 |

35 | 135 | 235 | 335 | 435 | 535 | 635 | 735 | 835 | 935 |

37 | 137 | 237 | 337 | 437 | 537 | 637 | 737 | 837 | 937 |

39 | 139 | 239 | 339 | 439 | 539 | 639 | 739 | 839 | 939 |

41 | 141 | 241 | 341 | 441 | 541 | 641 | 741 | 841 | 941 |

43 | 143 | 243 | 343 | 443 | 543 | 643 | 743 | 843 | 943 |

45 | 145 | 245 | 345 | 445 | 545 | 645 | 745 | 845 | 945 |

47 | 147 | 247 | 347 | 447 | 547 | 647 | 747 | 847 | 947 |

49 | 149 | 249 | 349 | 449 | 549 | 649 | 749 | 849 | 949 |

51 | 151 | 251 | 351 | 451 | 551 | 651 | 751 | 851 | 951 |

53 | 153 | 253 | 353 | 453 | 553 | 653 | 753 | 853 | 953 |

55 | 155 | 255 | 355 | 455 | 555 | 655 | 755 | 855 | 955 |

57 | 157 | 257 | 357 | 457 | 557 | 657 | 757 | 857 | 957 |

59 | 159 | 259 | 359 | 459 | 559 | 659 | 759 | 859 | 959 |

61 | 161 | 261 | 361 | 461 | 561 | 661 | 761 | 861 | 961 |

63 | 163 | 263 | 363 | 463 | 563 | 663 | 763 | 863 | 963 |

65 | 165 | 265 | 365 | 465 | 565 | 665 | 765 | 865 | 965 |

67 | 167 | 267 | 367 | 467 | 567 | 667 | 767 | 867 | 967 |

69 | 169 | 269 | 369 | 469 | 569 | 669 | 769 | 869 | 969 |

71 | 171 | 271 | 371 | 471 | 571 | 671 | 771 | 871 | 971 |

73 | 173 | 273 | 373 | 473 | 573 | 673 | 773 | 873 | 973 |

75 | 175 | 275 | 375 | 475 | 575 | 675 | 775 | 875 | 975 |

77 | 177 | 277 | 377 | 477 | 577 | 677 | 777 | 877 | 977 |

79 | 179 | 279 | 379 | 479 | 579 | 679 | 779 | 879 | 979 |

81 | 181 | 281 | 381 | 481 | 581 | 681 | 781 | 881 | 981 |

83 | 183 | 283 | 383 | 483 | 583 | 683 | 783 | 883 | 983 |

85 | 185 | 285 | 385 | 485 | 585 | 685 | 785 | 885 | 985 |

87 | 187 | 287 | 387 | 487 | 587 | 687 | 787 | 887 | 987 |

89 | 189 | 289 | 389 | 489 | 589 | 689 | 789 | 889 | 989 |

91 | 191 | 291 | 391 | 491 | 591 | 691 | 791 | 891 | 991 |

93 | 193 | 293 | 393 | 493 | 593 | 693 | 793 | 893 | 993 |

95 | 195 | 295 | 395 | 495 | 595 | 695 | 795 | 895 | 995 |

97 | 197 | 297 | 397 | 497 | 597 | 697 | 797 | 897 | 997 |

99 | 199 | 299 | 399 | 499 | 599 | 699 | 799 | 899 | 999 |