of 9

# Nats Decimal Keynote

Published on: Mar 3, 2016

#### Transcripts - Nats Decimal Keynote

• 1. DECIMALS An Explanation
• 2. WHAT IS A DECIMAL? A number written in the base ten system. Decimal point: A point that separates the ones place from the tenths.
• 3. BASE TEN SYSTEM Tenth: One of ten equal parts of a whole Hundredth: One of a hundred equal parts of a whole Whole number: A positive number or zero that represents a whole quantity.
• 4. DECIMAL PLACE VALUE Places to the right of the decimal point show parts of a whole. The place directly to the right of the decimal point is the tenths. The next place is the hundredths the next is the thousandths and so on.
• 5. ORDERING When you are putting decimals in order from least to greatest you need to know that adding zeros on to the end of a number does not change it’s value. That means that 0.5 is equal to 0.50. Also the number of numbers does not matter. This means that 0.6 is more than 0.259768. If you are ordering these decimals 1.09, 2.88, and 4.0 you would look at the ﬁrst numbers. The one with the biggest ﬁrst number is the biggest number. So the order from least to greatest is 4.0, 2.88, then 1.09.
• 6. ROUNDING Decimals are rounded in the same way as whole numbers. If the number is more than 5 you round up and if it is less you round down.
• 7. ADDING Step one: Line up the decimal point in both numbers in the problem. Step two: Add just as you would with whole numbers. Step three: Align the decimal point in the sum or difference with decimal points in the numbers above.
• 8. SUBTRACTING Step one: Line up the decimal point in both numbers in the problem. Step two: Subtract just as you would with whole numbers. Step three: Align the decimal point in the sum or difference with decimal points in the number above.
• 9. MULTIPLYING Step one: Multiply as you would with whole numbers. Step two: Count the number of places to the right of the decimal point in both factors. Step three: Count over from the right end of the product that same number of places. Step four: Insert the decimal point into the place you just counted to.