which of these numbers round to 600?
DESCRIPTION
Which of these numbers round to 600?. 568. 651. 509. 550. 600. 650. l l l l l l l l l l l. In this lesson you will learn how to round to the nearest 100 by using a number line. I I I I I I I I I. l l. - PowerPoint PPT PresentationTRANSCRIPT
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Which of these numbers round to 600?
568 651509
l l l l l l l l l l l550 650600
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In this lesson you will learn how to round to the nearest 100 by using a number line.
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Let’s ReviewLet’s Review
l l
150 160I I I I I I I I I
Benchmark Numbers
151 152 153 154 155 156 157 158 159
l l
100 200I I I I I I I I I
110 120 130 140 150 160 170 180 190
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Let’s ReviewLet’s Review
Rounding - To find a number that is close to a given number.
l l l l l l l l l l lBakery
Morgan
Ashley Pizza
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Let’s ReviewLet’s Review
I I I I I I I I Il l
400 500
Benchmark Numbers
410 420 430 440 450 460 470 480 490
What is a midpoint?
The midpoint marks the
middle of the line.
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Let’s ReviewA Common Mistake
Thinking that the increments on a number line always signify counting by
ones.
l l l l l l l l l 300 400 310 320 330 340 350 360 370 380 390
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Let’s ReviewA Common Mistake
Knowing when to round up or round down.
It is important to consider the number size and benchmark numbers when
rounding.
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Let’s ReviewCore Lesson How can I use benchmark numbers and midpoints to help
me round?
l l l l l l l l l l l
1,400 1,5001,450
Numbers less than the midpoint round down.
Numbers the same as or greater than the midpoint round up.
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Let’s ReviewCore Lesson
l l l l l l l l l l l
1,400 1,5001,450
1,400 1,500
1,4501,400-1,449 1,450 –
1,499
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Let’s ReviewCore Lesson
Round 349 to the nearest 100.
300 400Midpoint
l350
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Let’s ReviewCore Lesson
Round 1,472 to the nearest 100.
l l l l l l l l l l l1,400
1,5001410 1420 1430 1440 1450 1460 1470 1480 1490
Benchmark Numbers
Midpoint1,450
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In this lesson you have learned how to round to the nearest 100 by using a number line.
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Let’s ReviewGuided Practice
Round 2,639 to the nearest hundred.
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Let’s ReviewExtension Activities
In your math journal, explain why 395 rounds to 400 when rounding to the nearest ten and the nearest hundred.
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Let’s ReviewExtension Activities
Write 5 numbers that would round to 700 when rounding to the nearest 100.
Think of numbers that require rounding up as well as numbers that round down.
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Let’s ReviewExtension Activities
Draw a number line with 1,200 and 1,300 as the benchmark numbers.
What is the midpoint?
Where would 1,262 fall on the number line?
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Let’s ReviewQuick Quiz
1). Which of the following numbers do not round to 1,700?
1,734 1,656 1,7091,649
2). Round 883 to the nearest 100.