45 (number) facts for kids

Forty-five is a fascinating number that comes right after forty-four and before forty-six. It's an odd number, meaning it can't be divided evenly by two. Forty-five has several numbers that divide into it perfectly, like 1, 3, 5, 9, 15, and 45 itself. This makes it a special kind of number!

What Makes 45 Special?

The number 45 has some cool mathematical properties. It's a triangular number, which means you can arrange 45 dots into a triangle. Imagine stacking rows of dots: 1 dot, then 2 dots, then 3 dots, and so on, all the way up to 9 dots. If you add all those dots together (1+2+3+4+5+6+7+8+9), you get 45!

45 in Everyday Life

You might see the number 45 in many places around you. For example, old gramophone records often spun at 45 rpm, which is why they were sometimes called "45s." This speed was perfect for playing popular songs.

45 in Sports and Games

In some sports, 45 is a significant number. For instance, a half of a soccer (football) game usually lasts 45 minutes. In basketball, a 45-degree angle pass can be a very effective way to score.

Images for kids

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  A 45 rpm gramophone record

See also

In Spanish: Cuarenta y cinco para niños