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Introduction to DecimalsDecimals are the fractions with denominator 10,100,1000 and so on.In case of fractional numbers, we write them using numerators and denominators. But in decimal we use a decimal point. Example : 0.7,22.6, 234.85, etc. In the above figure there are 2 notes of 3 dollar = 2 x 3 = $6 There is one coin of 2 cents. Total money = $6 and 2 cents, this can be written as in decimal form as $ 6.02 ( as $1 = 100 cents) The number before the decimal point is called the whole part or integral part , Whereas the number after the decimal point is called the fractional part . Example : 43 is a whole part and 012 is a fractional part. These two parts are separated by a point called Decimal point. Some more examples : 1) 123.34 Here, 123 = whole part and .34 = Point 34 = fractional part 2) 0.85 Here, 0 = whole part and .85 = point 85 = fractional part 3) 1.40 Here, 1= whole part and .40 = Point 40 = fractional part. Place value The decimal part starts with tenth ( 1/10) . On the basis of place value we can read decimal numbers in following ways. 1) 23.112 In whole part > 3 = ones (unit )place 2 = tens place. In fractional part 1 = tenth(1/10) place 1 = hundredth (1/100) place 2 = thousandth (1/1000)place So it can be written in words as follows : Twenty three point one hundred and twelve thousandth. 2) 5.06 = Five point six hundredth 3) 0.6 = Six tenth 4) 123.345 = One hundred twenty three point three hundred and forty five thousandth. Introduction Decimals • DecimalExpansion • Comparingdecimal • AddingDecimals • SubtractingDecimals • MultiplyingDecimals • DividingDecimals • Decimalsfraction 7th grade math Home Page
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