How do you round 349 to the nearest 100? Will 349 round to 300 or 400?
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Transcript of How do you round 349 to the nearest 100? Will 349 round to 300 or 400?
How do you round 349 to the nearest 100?
Will 349 round to 300 or 400?
In this lesson you will learn how to round to the nearest
100 by using base ten blocks.
Let’s ReviewLet’s Review
Base Ten Blocks
OnesTensHundredsThousands
Let’s ReviewLet’s Review
Thousands Hundreds Tens Ones
2 4 6 7
Let’s ReviewA Common Mistake
Knowing when to round up or round down.
It is important to consider the number size and the benchmark numbers when
rounding.
Let’s ReviewCore Lesson
Rounding - To find a number that is close to a given number.
My family drove 323 miles on
vacation.
We drove about 320 miles.
Let’s ReviewCore Lesson
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48 49 50
51 52 53 54 55 56 57 58 59 60
61 62 63 64 65 66 67 68 69 70
71 72 73 74 75 76 77 78 79 80
81 82 83 84 85 86 87 88 89 90
91 92 93 94 95 96 97 98 99 100
Numbers less than the midpoint round down.
Numbers the same as or greater than the midpoint round up.
Let’s ReviewCore Lesson
Round 345 to the nearest hundred.
345 is between 300 and 400.
Let’s ReviewCore LessonRound 345
to the nearest 100.
100 200
300 400
The midpoint is 350.
Let’s ReviewCore Lesson
Round 564 to the nearest 100.
564 – = 500564 + = 600
6436
564 is between 500 and 600.
The midpoint of 500 and 600 is 550.
In this lesson you have learned how to round to the nearest
100 by using base ten blocks.
Let’s ReviewGuided Practice
1). Round 349 to the nearest hundred.
Let’s ReviewExtension Activities
Create the following numbers with base ten blocks. Round each number to the nearest 100.
165 247 1,152 85
Let’s ReviewExtension Activities
In your math journal, explain how to determine if a number rounds up or rounds down.
Round these numbers to the nearest 100.
631 790 1,482
Let’s ReviewQuick Quiz
1). Round 237 to the nearest 100.
2). Round 2,864 to the nearest 100.