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## M6 A.3.1.1 and A.3.1.3 Practice place value while you wait:

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**Welcome to Math**with Mrs. Cross M6 A.3.1.1 and A.3.1.3 Practice place value while you wait: http://www.toonuniversity.com/flash.asp?err=496&engine=9**What we know…**http://www.youtube.com/embed/3uEafe1r4GI?rel=0 - Rounding Rap**Rounding Rap**Yo, this is a story all about how My math got twisted upside down, I’d like to take a minute so sit right here I’ll tell you how I got from here to there. First find the place, okay get it Arrow to the right, underline the digit, 5 or above, give it a shove-- 4 or less, stay at rest. Flex your muscles like a hero Digits to the right turn to a zero, All the other digits remain the same And that’s how its done in the rounding game! PEACE OUT!!**Estimation is ...**• Estimation is finding a number that is close enough to the right answer. • You are not trying to get the exact right answer What you want is something that is good enough (usually in a hurry!)**When to use rounding…**• When the question asks you to estimate. • When the question asks “about how many”…? • When an exact answer isn’t possible. • When an answer is difficult to obtain.**Rounding Numbers**• Numbers 1 – 4 = ROUND DOWN • Numbers 5 – 9 = ROUND UP**Rounding Numbers**• Numbers 1 – 4 = ROUND DOWN • Numbers 5 – 9 = ROUND UP • Round 89 • Round 14 • Round 36**Place Value**9 1 2 , 4 3 6 , 7 8 2, 0 5 1 ones tens billions hundreds thousands ten millions millions ten billions ten thousands hundred billions hundred millions hundred thousands**Watch me:Round to the nearest tens place:**First find the place, okay get it 4 7 Circle the number in the tens place.**Round to the nearest tens place:**Arrow to the right, underline the digit, 4 7 Draw an arrow to the right of the number. Underline.**Round to the nearest tens place:**5 or above, give it a shove-- 4 or less, stay at rest. 4 7**Round to the nearest tens place:**5 or above, give it a shove-- 4 or less, stay at rest. 4 7 Add 1 to the tens place.**Round to the nearest tens place:**Flex your muscles like a hero Digits to the right turn to a zero, All the other digits remain the same And that’s how its done in the rounding game! 47 = _____**The Answer**47 rounded to the nearest tens place is 50 47 50 40 Note 47 is closer to 50 on the number line.**Round to the nearest thousands place:**First find the place, okay get it 3, 2 5 9 Circle the number in the thousands place.**Round to the nearest tens place:**Arrow to the right, underline the digit, 3, 2 5 9 Draw an arrow to the right of the number. Underline.**Round to the nearest tens place:**5 or above, give it a shove-- 4 or less, stay at rest. 3, 2 5 9 2 shows us to do what?**Round to the nearest tens place:**5 or above, give it a shove-- 4 or less, stay at rest. 3, 2 5 9 2 should stay at rest**Round to the nearest tens place:**Flex your muscles like a hero Digits to the right turn to a zero, All the other digits remain the same And that’s how its done in the rounding game! 3,259 = _______**The Answer**3,259 rounded to the nearest thousands place is 3,000 3,259 4,000 3,000 Note 3,259 is closer to 3,000 on the number line.**Round these numbers to the nearest ten.**• 1) 256 = • 2) 39 = • 3) 7682 = • 4) 956 = • 5) 1231 = • 6) 344 =**Round these numbers to the nearest hundreds.**• 1) 256 = • 2) 3109 = • 3) 76,982 = • 4) 956 = • 5) 1231 = • 6) 344 =**Round these numbers to the nearest thousands.**• 1) 1256 = • 2) 32,109 = • 3) 76,982 = • 4) 3956 = • 5) 1231 = • 6) 3474 =**Name the hundreds each is between**• 516 • 809 • 447 • 782 • 124 • 450**Name the tens each is between**• 84 • 33 • 58 • 91 • 23 • 15**Name the thousands each is between**• 4,309 • 6,500 • 2,833 • 5,432 • 1,875 • 3,598**Rounding to a Certain Place Value**• Estimate by rounding to the nearest ten. What numbers should you use to estimate 33 + 37? • THINK: • Which is the nearest ten for 33? • Which is the nearest ten for 37? 30 31 32 33 34 35 36 37 38 39 40**Estimate by rounding to the nearest ten. What numbers**should use to estimate 56 + 67?A. 50+60B. 50+70C. 60+60D. 60+70**Round each number to the nearest ten and then add.1,357 +**729 A. 2,000B. 1,700C. 2, 090D. 2, 100**Nearest Hundred**• Round each number to the nearest hundred and then add. 274 + 3,964 = A. 3,400 B. 4,100 C. 4,300 D. 4,000**Estimate by rounding to the nearest hundred.**What numbers should you use to estimate 641 plus 378? A. 700 + 400 B. 600 + 400 C. 700 + 300 D. 600 + 300**Which of the following should you use to estimate 5,789 –**4,678 to the nearest thousand?A. 5,000 –5,000B. 6,000- 5,000C. 6,000-4,000D. 5,700-4,700**Round each number to the nearest thousand and then**subtract.7,345 – 3,446A. 4,000B. 3,000C. 5,000D. 2,000**Estimation**• Remember Estimation is not an exact answer • It should be around the answer, but not exactly it. • Round the numbers first, then calculate. • Use Mental Math and Rounding to make numbers easier to work with.