If you add up the numbers 1 to 1, 000 consecutively, the answer will be 5050.
Among all the 2-dimensional shapes, circle has the largest area but the shortest perimeter.
Prime number is the whole number that can divided by itself and 1 only. Odd number cannot be divided by 2 exactly whereas even number can be diveded by 2 exactly.
The sum of 2 odd numbers is always an even number. For example, 3+7=10 @ 5+9=14
The sum of an odd number and an even number is always an odd number. for example, 1+2=3 @ 5+8=13
The product of the two odd number and an even number is always an even number. For example, 4×3=12
The difference of the two odd number is always an even number. For example, 5-3=2
Number Divisible by 2
All the even numbers (numbers ending with 0, 2, 4, 6, or 8) are divisible by 2.
For example,
3,698÷2=1849
Number Divisible by 3
All the digits in a number.
If the sum of all the digits in a number is divisible by 3, then that number is divisible by 3.
For example,
3,927 ---- (3+9+2+7)÷3=7
therefore, 3927÷3=1,309
180,954 ---- (1+8+0+9+5+4)÷3=9
Francesco Pellos first used decimals in 1942. He used 2.5 to represent two and one over two.
A human hair is normally 0.008cm thick.
The thickness of a sheet of paper is normally 0.012cm.
The Chinese used the idea of negative numbers as early as 200BC and the Indians used it as early as the 7th century. Negative numbers were regarded as impossible numbers in Europe until the 17th century.
Muhammad ibn Musa al-Khawarizmi, a well-known Arabian mathematician in the 9th century, was conferred the title 'Father of Algebra'. He had written a book on algebra entitled 'al-jabr wa'l-Muqabalah'.
Here are a few amazing prime numbers, these prime numbers were proved by the XVIIIth century.
31
331
3331
33331
333331
3333331
33333331
333333331
The next number 333333331 is not a prime number. Whereas it is multipled by 17x19607843.
To multiply by a 2-digit number add the two digits and place the sum between.
For example, 234x11=2574
