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Presentation transcript:

n1r1TI n1r1TI

Find your number Find your number Look right next door Look right next door 4 or less just ignore 4 or less just ignore 5 or more, add 1 more 5 or more, add 1 more Everything after is a zero, Everything after is a zero, no more no more

What is rounding? Rounding means changing a given number to the nearest ten, hundred, thousand, and so on. Numbers can be rounded to the nearest ten, the nearest hundred, the nearest thousand, and so on.

To round a number to a given place: Find your numberStep 1: Find your number circle Find the place you are rounding to: ten, hundred, thousand or another place value and circle it. ie: Round 6,438 to the nearest hundred H thT thThHTO 6438

Look right next door (Step 2: Look right next door ( Look at the digit to its right) and underline it. H thT thThHTO 6438

H thT thThHTO 6438 H thT thThHTO 6400

To round a number to a given place: Find your numberStep 1: Find your number circle Find the place you are rounding to: ten, hundred, thousand or another place value and circle it. ie: Round 6,458 to the nearest hundred H thT thThHTO 6458

Look right next doorStep 2: Look right next door ( ( Look at the digit to its right) and underline it. H thT thThHTO 6458

5 or more, add 1 more 5 or more, add 1 more If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up. (add 1 to the number in the circle) ie: Look in the ten place of the number 6,458. We see a 5, so we must add 1 to the number in the circle. H thT thThHTO = 5 H thT thThHTO 65

H thT thThHTO 6500

ten  Round 13,528 to the nearest ten. 13,5288 > 5 up Round up 13,530to 13,530 hundred  Round 13,528 to the nearest hundred 13,5282 < 5 down Round down 13,500to 13,500. thousand  Round 13,528 to the nearest thousand. 13,5285=5 up Round up 14,000to 14,000 All the numbers to the right of the place you are rounding to become zeros.

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You can use a number line to round a whole number to a given place. 2,683 Round 2,683 to the nearest hundred. First, find the rounding place Hundreds

Then, find the number on a number line. 2,683 is between 2600 and 2,700

Round the number to the closest hundred on the number line. 2,700 is the closest hundred. Round 2,683 up to 2,700.

Hint: If a number is located directly in the middle of the number line, round up.

Consider the number 4,827. – 4,827 rounded to the nearest ten is 4,830 – 4,827 rounded to the nearest hundred is 4,800 – 4,827 rounded to the nearest thousand is 5,000 Here are some more examples: – 34 rounded to the nearest ten is 30 – 6,809 rounded to the nearest hundred is 6,800 – 1,951 rounded to the nearest thousand is 2,000

Rounding is a form of estimation that you use when an approximation is good enough. For example when you are buying a TV at the store. The cost might be marked at $ You could say it is about $ Rounding is also good to use so that you know what to expect for an answer. It is good to use this skill when you are plugging numbers into a calculator. Ex. Let's say you are adding up your expenses for the month. Power: $230, Telephone: $79.68 Rent: $470 Car Payment: $822. To get a good approximation of the money you will need you could round to the closest hundred: Power: $230 would be$200 Phone $79.68 would be $100 Rent: $470 would be $500 Car: $822 would be $800 Total: $1601 which is close to the estimated total of $1600

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1. Round to the nearest thousand: a) 14,389 14,000 d) 9,520 _________ b) 219,610 _________ e) 756,239 _________ c) 365,492 ________ f) 189,743 _________ 2. Round to the nearest ten thousand: a) 924,987 _________ d) 824,033 _________ b) 537,096 _________ e) 295,474 _________ c) 145,302 _________ f) 777,330 _________ 3. Round to the nearest hundred thousands: a) 898,456 _________ d) 514,358 _________ b) 286,673 _________ e) 979,842 _________ c) _________ f) 275,321 _________

3. Round to the nearest hundred: a) 847 _________ d) 333 _________ b) _________ e) _________ c) _________ f) 555 _________ 6. Round to the nearest hundred thousand: a) _________ d) _________ b) _________ e) _________ c) _________ f) _________