To read decimals, – read the whole number to the left of the decimal point, if there is one; – read the decimal point as “and”; – read the digits to the right of the decimal point just as you would read a whole number; and – say the name of the place value of the digit in the smallest place. Decimals may be written in a variety of forms: – Standard: 23.456 – Written: Twenty-three and four hundred fifty-six thousandths -- Expanded: (2 10) + (3 1) + (4 0.1) + (5 0.01) + (6 0.001) Thousandths Hundredths Tenths Ones Tens Hundreds Thousands Ten Thousands Millions Hundred Thousands 5.1 – Rounding Decimals Write each number in standard form, written form, and expanded form. Example 1 Standard _____________________________________________________________________________________ Written _____________________________________________________________________________________ Expanded _____________________________________________________________________________________ Example 2 Standard _____________________________________________________________________________________ Written _____________________________________________________________________________________ Expanded _____________________________________________________________________________________ Rounding decimals is very similar to rounding whole numbers. Find your place Look next door 5 or greater, add one more (to the underlined number) 4 or less it stays the same As for the rest, their at the game! Round 472.78 to the nearest tenth 472.78 Round 13.192 to the nearest hundredth 13.192 Think about it!! What would it mean if you are asked to round to the nearest whole number? Why? _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________