The Art of Rounding Numbers: A Comprehensive Guide
Explore the world of rounding decimal and whole numbers with practical examples and easy-to-understand rules. From basic concepts to special cases, learn how to round numbers effectively with clear explanations and helpful tips.
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Presentation Transcript
Rounding Decimal Numbers Sometimes close enough is good enough!
Molly has $16 in her pocket She buys: 3 hotdogs @ $1.89 each 3 milkshakes @ $2.19 each 3 Large French fries @ $ $1.79 each Does she have enough money?
Gas costs $1.79 per gallon I m running on empty and I have a 20 gallon tank on my truck About how much will it cost to fill up?
You have one hour to take a 50 question test. About how much time can you spend on each question? Close enough is good enough!
The rounding poem Find your number Look right next door 4 or less you just ignore 5 or more add one more!
Rounding Whole Numbers Round 474 to the closest hundred. Find your number 474 Look right next door Four or less you just ignore Five or more, add one more
474 Rounded to the hundreds becomes 500 Round 474 to the closest 10 s 474 Just ignore - 470
What about decimal numbers The same rules (and poem) apply! Round 4.167 to the closest hundredths 4.167 Find your number Look right next door 4.17
Remember If you are asked to round to the nearest tenth .your answer stops at the tenth place! Example: Round 42.73 to the closest tenth would be 42.7
Special Case! Rounding a 9 Round 2.197 to the closes hundredths Since there is a 9 in the hundredths place consider the tenth and hundredths together 19 do you leave it at 19 or move it to 20?
Round 4.95 to the closest tenth Since there is a 9 in the tenth spot consider the ones and tenths together should you leave it at 49 or move it to 50? 4.95 rounded to the nearest tenth is 5.0
Try these Round to hundredths Round to tenths: 18.784 18.78 4.56 4.6 9.45672 9.46 5.327 5.3 10.00 9.997 0.98 1.0
Practice Page 147 #1-6 and 8 #1) 0.3 #2) 2 #3) 45.52 #4) 0.589 #5) 7.6760 #6) 30 #8) $2.97
