Round decimals

Learning Objectives Identify the whole number part and the decimal part of a number. Name the digit in the tenths place. Use a number line to find the nearest whole number to a given decimal. State and apply the rule for rounding decimals to the nearest whole number. Convert simple fractions with a denominator of 10 into decimals. Use rounded decimals as a quick strategy to estimate which of two fractions is larger. Imagine you have a cookie that is 0.8 of a whole. Is that almost a whole cookie or almost no cookie at all? 🍪 Let's find out! Today, we will learn about special numbers called decimals, which are another way to show parts of a whole, just like fractions! We will learn a cool trick called 'rounding' to make these numbers simpler. This trick can he...

TermDefinitionExample DecimalA number that uses a decimal point to show a value that is a part of a whole. It's like a fraction in a different costume!0.5 is a decimal. It means one-half, just like the fraction 1/2. Decimal PointThe little dot in a decimal number. It separates the whole numbers on the left from the parts of a whole on the right.In the number 3.4, the dot between the 3 and the 4 is the decimal point. Tenths PlaceThe very first place to the right of the decimal point. It tells us how many tenths of a whole we have.In 0.7, the 7 is in the tenths place. This is the same as the fraction 7/10. RoundingMaking a number simpler by changing it to the closest 'friendly' number, like the nearest whole number or ten.The number 2.9 is very close to 3, so we can round it...

The Rounding Rule (To the Nearest Whole Number) Look at the digit in the tenths place. If it is 0, 1, 2, 3, or 4, round down. If it is 5, 6, 7, 8, or 9, round up. This is the main rule for rounding. To round to the nearest whole number, we only need to look at the first digit after the decimal point (the tenths digit) to decide if we go up to the next whole number or stay at the current one. Tenths as Fractions Formula 0.X = \frac{X}{10} This formula shows how a decimal in the tenths place is the same as a fraction with a denominator of 10. The digit in the tenths place becomes the numerator.