m6 a.3.1.1 and a.3.1.3 practice place value while you wait: e=9
TRANSCRIPT
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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
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What we know…
http://www.youtube.com/embed/3uEafe1r4GI?rel=0 - Rounding Rap
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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!!
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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!)
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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.
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Rounding Numbers
• Numbers 1 – 4 = ROUND DOWN• Numbers 5 – 9 = ROUND UP
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Rounding Numbers
• Numbers 1 – 4 = ROUND DOWN • Numbers 5 – 9 = ROUND UP
• Round 89• Round 14• Round 36
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Place Value
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Watch me:Round to the nearest tens place:
First find the place, okay get it
4 7
Circle the number in the tens place.
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Round to the nearest tens place:
Arrow to the right, underline the digit,
4 7Draw an arrow to the right of
the number. Underline.
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Round to the nearest tens place:
5 or above, give it a shove-- 4 or less, stay at rest.
4 7
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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:
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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:
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The Answer
47 rounded to the nearest tens
place is 50
40 5047
Note 47 is closer to 50 on the number line.
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Round to the nearest thousands place:
First find the place, okay get it
3, 2 5 9Circle the number in the thousands place.
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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.
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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?
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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:
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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 = _______
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The Answer
3,259 rounded to the nearest
thousands place is 3,000
3,000 4,0003,259
Note 3,259 is closer to 3,000 on the number line.
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Round these numbers to the nearest ten.
1) 256 =
2) 39 =
3) 7682 =
4) 956 =
5) 1231 =
6) 344 =
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Round these numbers to the nearest hundreds.
1) 256 =
2) 3109 =
3) 76,982 =
4) 956 =
5) 1231 =
6) 344 =
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Round these numbers to the nearest thousands.
1) 1256 =
2) 32,109 =
3) 76,982 =
4) 3956 =
5) 1231 =
6) 3474 =
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Name the hundreds each is between
1. 516
2. 809
3. 447
4. 782
5. 124
6. 450
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Name the tens each is between
1. 84
2. 33
3. 58
4. 91
5. 23
6. 15
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Name the thousands each is between
1. 4,309
2. 6,500
3. 2,833
4. 5,432
5. 1,875
6. 3,598
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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
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Estimate by rounding to the nearest ten. What numbers should use to estimate 56 + 67?
A. 50+60B. 50+70C. 60+60D. 60+70
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• Round each number to the nearest ten and then add.
1,357 + 729
A. 2,000B. 1,700C. 2, 090D. 2, 100
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Round each number to the nearest ten, and then solve.
48 + 57 = 32 – 12 = 45 + 15 =
68 – 22 = 93 + 33 = 88 – 54 =
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Nearest Hundred
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Nearest Hundred
• Round each number to the nearest hundred and then add.
274 + 3,964 =A. 3,400B. 4,100C. 4,300D. 4,000
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• 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 + 300
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Round each number to the nearest hundred, and then solve.
243 + 517 = 392 – 182 = 405 + 195 =
648 – 322 = 973 + 313 = 858 – 524 =
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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
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• Round each number to the nearest thousand and then subtract.
7,345 – 3,446
A. 4,000B. 3,000C. 5,000D. 2,000
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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 =
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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.