Decimals are numbers that show parts of a whole, written using a decimal point. They come from fractions with denominators like 10, 100, or 1000. For example, 1/10 = 0.1, 1/100 = 0.01, and 1/1000 = 0.001. The decimal point separates whole numbers from fractional parts, which have place values like tenths, hundredths, and thousandths. Place value charts help us understand each digit’s position. Real-life examples and exercises help students convert fractions to decimals, read decimal numbers, and find the value of digits in different places.