GRADE 9 REVIEW Rounding off and Percents Rounding

Rounding Off • Step 1: Identify the place value required in the answer. •

Rounding Off Examples: a) Round each to the indicated value: a) b) c) d)

Percents • The term “cent” means 100. • There are 100 cents in a

Converting Between Percents and Decimals • Converting from percents to decimals • Divide the

Converting Between Percents and Decimals • Example: Convert each to a decimal a) 0.

Converting Between Percents and Decimals • Converting from decimals to percents • Multiply the

Finding a Percent of a Number • To find the percentage of a value

Percents and Taxes • In 2014, Manitobans had a Provincial Sales Tax (PST) of

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GRADE 9 REVIEW Rounding off and Percents

Rounding Off • Step 1: Identify the place value required in the answer. • Step 2: Look at the next number to its right. • If that number is less than 5, then do not round. • If that number is greater than (or equal to) 5, then round up • **Rounding off to two decimal places is sufficient unless otherwise stated in the question

Rounding Off •

Rounding Off Examples: a) Round each to the indicated value: a) b) c) d) 12. 564 13. 4463955 2478 258889 b) Round each to the indicated value: a) 399 b) 1498. 99 c) 59. 5999 d) 499999

Percents • The term “cent” means 100. • There are 100 cents in a loonie. • There are 100 centimetres in a metre. • The term “per” indicates “out of”. • So a percent is a value out of 100. Example: • If you scored 65% on a test that means you earned 65 marks out of a possible 100. • When weather forecasters say “there is 100% chance of snow”, that indicates there will definitely be snow!

Converting Between Percents and Decimals • Converting from percents to decimals • Divide the percent by 100 • Example: Convert each to a decimal a) 42% = b) 37% = c) 98% = d) 63. 2% =

Converting Between Percents and Decimals • Example: Convert each to a decimal a) 0. 32% = b) 0. 045% = c) 146% = d) 222% =

Converting Between Percents and Decimals • Converting from decimals to percents • Multiply the decimal by 100 • Example: Convert each to a percent a) 0. 32 = b) 0. 77 = c) 0. 04 = d) 0. 045 =

Finding a Percent of a Number • To find the percentage of a value • Convert the percent to a decimal • Multiply the decimal by the number you are finding the percent of Example a) Find 26% of 500 b) Find 13% of 200 c) Find 75% of 1304 d) Find 66. 66% of 12 e) Find 125% of 10

Percents and Taxes • In 2014, Manitobans had a Provincial Sales Tax (PST) of 8%, and a federal government Goods and Services Tax (GST) of 5%. These taxes are added to the price of most purchases and sevices. Example 1: You go to a store to purchase some jeans that cost $29. Find the total price including taxes. Solution: