RS Aggarwal Solutions for Class 7 Chapter 3 “Decimals”- a decimal is any number in our base-ten number system. Decimal numbers are used in situations which require more precision than whole numbers can provide. As we move to the right of the decimal point, each number place is divided by 10. The decimal point helps in separating the ones place from the tenths place in the number. Related topics include a method of converting a decimal into a fraction, converting a fraction into a decimal, addition and subtraction of decimals, multiplication of decimal by 10,100, 100,etc., multiplication of decimal by whole number, multiplication of decimal by a decimal, division of decimals by 10, 100, 1000,etc., dividing a decimal by the whole number.