# Odd or even calculator

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.

## 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, x2the 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 coordinatesand therefore passes through the point (0,0).

Typical examples of odd functions are x, x3, 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