with Mrs Cross M6 A311 and A313 Practice place value while you wait httpwwwtoonuniversitycomflashasperr496ampengine9 What we know httpwwwyoutubecomembed3uEafe1r4GIrel0 ID: 401337
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Slide1
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
Slide2
What we know…http://www.youtube.com/embed/3uEafe1r4GI?rel=0 - Rounding RapSlide3
Rounding RapYo, this is a story all about howMy math got twisted upside down,I’d like to take a minute so sit right hereI’ll tell you how I got from here to there.First find the place, okay get itArrow to the right, underline the digit,5 or above, give it a shove-- 4 or less, stay at rest.Flex your muscles like a heroDigits to the right turn to a zero,All the other digits remain the sameAnd that’s how its done in the rounding game!PEACE OUT!!Slide4
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!) Slide5
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.Slide6
Rounding NumbersNumbers 1 – 4 = ROUND DOWNNumbers 5 – 9 = ROUND UPSlide7
Rounding NumbersNumbers 1 – 4 = ROUND DOWN Numbers 5 – 9 = ROUND UPRound 89Round 14Round 36Slide8
Place Value9 1 2 , 4 3 6 , 7 8 2, 0 5 1hundred millionsten millionsmillionshundred thousands
ten thousands
thousands
hundreds
tens
ones
hundred billions
ten billions
billionsSlide9
Watch me:Round to the nearest tens place:First find the place, okay get it4 7 Circle the number in the tens place.Slide10
Round to the nearest tens place:Arrow to the right, underline the digit,4 7Draw an arrow to the right of the number. Underline
.Slide11
Round to the nearest tens place:5 or above, give it a shove-- 4 or less, stay at rest.4 7Slide12
5 or above, give it a shove-- 4 or less, stay at rest.4 7Add 1 to the tens place.
Round to the nearest tens place:Slide13
Flex your muscles like a heroDigits to the right turn to a zero,All the other digits remain the sameAnd that’s how its done in the rounding game!47 = _____Round to the nearest tens place:Slide14
The Answer47 rounded to the nearest tens place is 504050
47
Note 47 is closer to 50 on the number line.Slide15
Round to the nearest thousands place:First find the place, okay get it3, 2 5 9Circle the number in the thousands place.Slide16
Round to the nearest tens place:Arrow to the right, underline the digit,3, 2 5 9Draw an arrow to the right of the
number
.
Underline
.Slide17
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?Slide18
5 or above, give it a shove-- 4 or less, stay at rest.3, 2 5 92 should stay at rest
Round to the nearest tens place:Slide19
Flex your muscles like a heroDigits to the right turn to a zero,All the other digits remain the sameAnd that’s how its done in the rounding game!Round to the nearest tens place:3,259 = _______Slide20
The Answer3,259 rounded to the nearest thousands place is 3,0003,0004,000
3,259
Note
3,259
is closer to
3,000
on the number line.Slide21
Round these numbers to the nearest ten.1) 256 =2) 39 =3) 7682 =4) 956 =5) 1231 =6) 344 = Slide22
Round these numbers to the nearest hundreds.1) 256 =2) 3109 =3) 76,982 =4) 956 =5) 1231 =6) 344 = Slide23
Round these numbers to the nearest thousands.1) 1256 =2) 32,109 =3) 76,982 =4) 3956 =5) 1231 =6) 3474 = Slide24
Name the hundreds each is between516 809447782124450Slide25
Name the tens each is between843358912315Slide26
Name the thousands each is between4,3096,5002,8335,4321,8753,598Slide27
Rounding to a Certain Place ValueEstimate 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 40Slide28Slide29
Estimate by rounding to the nearest ten. What numbers should use to estimate 56 + 67?A. 50+60B. 50+70C. 60+60D. 60+70Slide30
Round each number to the nearest ten and then add.1,357 + 729 A. 2,000B. 1,700C. 2, 090D. 2, 100Slide31
Round each number to the nearest ten, and then solve.48 + 57 =32 – 12 =45 + 15 =68 – 22 =93 + 33 =88 – 54 =Slide32
Nearest HundredSlide33
Nearest HundredRound each number to the nearest hundred and then add. 274 + 3,964 =A. 3,400B. 4,100C. 4,300D. 4,000Slide34
Estimate by rounding to the nearest hundred.What numbers should you use to estimate 641 plus 378?A. 700 + 400B. 600 + 400C. 700 + 300 D. 600 + 300Slide35
Round each number to the nearest hundred, and then solve.243 + 517 =392 – 182 =405 + 195 =648 – 322 =973 + 313 =858 – 524 =Slide36
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. 5,700-4,700Slide37
Round each number to the nearest thousand and then subtract.7,345 – 3,446A. 4,000B. 3,000C. 5,000D. 2,000Slide38
Round each number to the nearest thousand, and then solve.4,218 + 1,257 =4,832 – 1,222 =4,985 + 1,465 =8,642 – 2,468 =9,093 + 6,833 =8,478 – 1,454 =Slide39
EstimationRemember Estimation is not an exact answerIt 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.