Page 152 - NUMINO TB_2A
P. 152
Who Invented the Multiplication Sign, ^?
When you add the same
numbers, it is a good idea
to use ^.
“A number plus 2 is 5.”
We can write this as “ + 2 = 5.”
In math, signs are very important.
We can use them to write simple number
sentences.
Oughtred
The multiplication sign, ^, was introduced 100 years after + and -.
In 1631, William Oughtred first used ^ in his book,
The Key to Mathematics. Oughtred used more than 150 math signs
in his book. Some of them, like ^, are still used today.
15. Counting in Groups 141
When you add the same
numbers, it is a good idea
to use ^.
“A number plus 2 is 5.”
We can write this as “ + 2 = 5.”
In math, signs are very important.
We can use them to write simple number
sentences.
Oughtred
The multiplication sign, ^, was introduced 100 years after + and -.
In 1631, William Oughtred first used ^ in his book,
The Key to Mathematics. Oughtred used more than 150 math signs
in his book. Some of them, like ^, are still used today.
15. Counting in Groups 141
