Ch 2 Decimals Powerpoint
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This document discusses decimals, place value, comparing and ordering decimals, and converting fractions to decimals. Some key points: - Decimals represent numbers with fractional parts, written with a decimal point. The value of each digit depends on its place from the decimal point. - To compare decimals, look first at the ones place, then tenths, hundredths, etc. - Fractions can be converted to decimals by dividing the numerator by the denominator. Repeating the division yields a terminating or non-terminating decimal.
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This document discusses decimals, place value, comparing and ordering decimals, and converting fractions to decimals. It provides examples of decimals representing quantities like money, ratios, and measurements. Key concepts covered include:
1) The value of digits in a decimal is based on powers of ten, with digits to the left of the decimal point representing whole numbers and digits to the right representing fractional values.
2) Decimals can be compared by examining the place value of the digits, reading from left to right.
3) Fractions can be converted to decimals by dividing the numerator by the denominator.
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To multiply decimals, you can:
1. Multiply the numbers as usual and place the decimal point in the product by counting decimal places. For example, 0.7 * 0.5 = 0.35.
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3. Convert decimals to fractions and multiply the fractions. For example, 0.7 = 7/10, 0.5 = 5/10, so 0.7 * 0.5 = 7/10 * 5/10 = 35/100 = 0.35.
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3) It provides multiple models and strategies for teaching addition including set models, measurement models, counting upwards from a number, and using a bunny on a number line.
4) It notes other names for addition, how to add numbers with more than one digit by carrying values to the next column, and rules for addition.
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Addition is the process of combining sets of items and counting the total. It is demonstrated with examples of having 2 apples and receiving 3 more for a total of 5 apples, and using 4 red apples and 2 yellow apples for a total of 6 apples needed for a pie. Addition finds the full amount when sets are joined together.
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