Decimal powerpoint presentation(1)
- 4. Thousandths follow a similar pattern. They have three digits after the decimal point. The decimal 0.749 is pronounced "seven hundred forty-nine thousandths" or "zero point seven forty-nine". There may be zeros after the decimal point. The decimal 0.064 is pronounced "sixty-four thousandths" or "zero point zero sixty- four". A decimal number may be larger than 1. The word and may be used to indicate the decimal point so it should not be used in other parts of the name of the decimal. The decimal 234.987 could be pronounced Two hundred thirty-four AND nine hundred eighty-seven thousandths.
- 6. • Decimals are fractional numbers. The decimal 0.3 is the same as the fraction 3/10. The number 0.78 is a decimal that represents 78/100. • Adding Decimals is just like adding other numbers. • Always line up the decimal points when adding decimals. • Remember to put the decimal point in the proper place in your answer.
- 7. Subtracting Decimals is just like subtracting other numbers. Always line up the decimal points when subtracting decimals. Remember to put the decimal point in the proper place in your answer
- 16. • Example: 68 is what percent of 87? • Divide the first number by the second (e.g. 68 ÷ 87 = 0.7816) • Multiply the answer by 100 (Move decimal point two places to the right) (e.g. 0.7816*100 = 78.16) • Round to the desired precision (e.g. 78.16 rounded to the nearest whole number = 78) • Follow the answer with the % sign (e.g. 68 is 78% of 87)
- 17. • Decimals are a type of fractional number. The decimal 0.5 represents the fraction 5/10. The decimal 0.25 represents the fraction 25/100. Decimal fractions always have a denominator based on a power of 10. • We know that 5/10 is equivalent to 1/2 since 1/2 times 5/5 is 5/10. Therefore, the decimal 0.5 is equivalent to 1/2 or 2/4, etc. • Some common Equivalent Decimals and Fractions: 0.1 and 1/10 • 0.2 and 1/5 • 0.5 and 1/2 • 0.25 and 1/4 • 0.50 and 1/2 • 0.75 and 3/4 • 1.0 and 1/1 or 2/2 or 1
- 18. • Do the following steps to convert a fraction to a decimal: For example: Convert 4/9 to a decimal. • Divide the numerator of the fraction by the denominator (e.g. 4 ÷ 9=0.44444) • Round the answer to the desired precision.
- 19. • Do the following steps to convert a fraction to a percent: For example: Convert 4/5 to a percent. • Divide the numerator of the fraction by the denominator (e.g. 4 ÷ 5=0.80) • Multiply by 100 (Move the decimal point two places to the right) (e.g. 0.80*100 = 80) • Round the answer to the desired precision. • Follow the answer with the % sign (e.g. 80%)
- 20. • Do the following steps to convert a percent to a fraction: For example: Convert 83% to a fraction. • Remove the Percent sign • Make a fraction with the percent as the numerator and 100 as the denominator (e.g. 83/100) • Reduce the fraction if needed