World Book Trivia Quiz For Kids-6/11-numbers

Explanation
There are different kinds of numbers. Cardinal numbers are numbers that tell how many things there are, such as “I have five apples.” Ordinal numbers are numbers that tell the position of something in a group, such as “I am sixth in line.”

Explanation
A number symbol is called a numeral . When we want to write down a number, we can write either the numeral or the word.

Explanation
An abacus is a counting board used to do arithmetic problems. It was used by the ancient Greeks and Romans. Abacuses are still used today in China and other countries.

Explanation
Arithmetic is the study of numbers. People use arithmetic to work with whole numbers, fractions such as 1/2 and 1/4, and decimals such as .10 and .25. They add, subtract, multiply, and divide numbers. The skills used in arithmetic are used in many other kinds of mathematics, too.

Explanation
The Chinese developed a number system that used fractions, zero, and numbers less than zero.

Explanation
Prime number is a whole number greater than 1 that can be divided without a remainder only by itself and by 1. The sequence of prime numbers begins: 2, 3, 5, 7, 11, 13, 17, and so on. All whole numbers greater than 1 that are not prime numbers are called composite numbers.

Explanation
Carl Friedrich Gauss (1777-1855) was a German mathematician. His ideas had enormous influence in nearly all areas of mathematics. He is sometimes called the “prince of mathematics.”
Gauss proved a rule called the fundamental theorem of arithmetic. This rule has to do with natural numbers (1, 2, 3, 4, and so on). It states that every natural number can be gotten by multiplying a unique set of prime numbers. A prime number is a natural number that can be divided evenly only by itself and 1.

Explanation
The word decimal comes from decem, the Latin word for ten. The decimal system got its name because it is a base-ten system. The value of each place is 10 times greater than the value of the place just to its right. Thus, the symbols on the left of a number have larger values than symbols farther to the right.

The decimal system was developed in India more than 2,000 years ago.

Explanation
Thomas Harriot (1560-1621) was an English mathematician. He also studied astronomy, navigation, and mapmaking. Harriot is best known for his book on algebra, Artis analyticae praxis (1631). Harriot introduced the symbols for greater than (>), less than (

Explanation
Sudoku puzzles do not use arithmetic skills like adding and subtracting. Instead, a player uses reasoning (thinking) to narrow down the possible answers for a square.