Lesson 3 1 Rounding and Estimating Writing Decimals

• Writing Decimals 2. 32984 Express 0. 426 using words. And represents the

• Some real life problems require only an estimate while others require an

• You can round decimals when you don’t need exact values. • When

• Round to the nearest hundredth 4. 729 0. 2729 • Round to

• ≈ means approximately equal to 126 ≈ 130 One way to estimate

• Front end estimating – add the front-end digits. Round to estimate the

• You can use clustering to estimate the sum of several numbers that

Slides: 8

Download presentation

Lesson 3 -1 Rounding and Estimating

• Writing Decimals 2. 32984 Express 0. 426 using words. And represents the decimal point Write two and three hundredths

• Some real life problems require only an estimate while others require an exact answer. – A headline noting the number of people living in China. – The amount of money a baby sitter charges per hour. – The width of a window screen. – The distance from Earth to the moon. – The hours at football practice in one month. – The number of tickets sold for a play.

• You can round decimals when you don’t need exact values. • When rounding if the number to the right is 5 or greater---round up • When the number to the right is less than 5 do not change the number

• Round to the nearest hundredth 4. 729 0. 2729 • Round to the nearest tenth 84. 639 1. 182

• ≈ means approximately equal to 126 ≈ 130 One way to estimate is to round all numbers to the same place 464. 90 – 125. 73

• Front end estimating – add the front-end digits. Round to estimate the sum of the remaining digits. Then combine estimates. • Carrots cost $2. 71, peppers cost $1. 73 and broccoli costs $1. 10. Estimate the total cost of the vegetables

• You can use clustering to estimate the sum of several numbers that are close to the same value