rounding&mathline rounding. rounding is also referred to as estimating rounding
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Rounding Rounding &&
MathLineMathLine
Rounding
Rounding is also referred Rounding is also referred to as estimatingto as estimating
Rounding
MathLine offers a very effective way to build a MathLine offers a very effective way to build a concrete picture of roundingconcrete picture of rounding
Rounding
Rounding is challenging for many students Rounding is challenging for many students
while connecting tactile objects while connecting tactile objects to abstract numbers. to abstract numbers.
Round 67 to the nearest 10Round 67 to the nearest 10
Rounding
Rounding
Either round down to 60 Either round down to 60
60 7067
or round up to 70or round up to 70
Rounding
60
There are 3 questions to determine There are 3 questions to determine which ten is correct.which ten is correct.
67 70
Rounding
60 67
1) To which ten is 67 closer?1) To which ten is 67 closer?
70
Is 67 closer to 70?Is 67 closer to 70?
Rounding
60 67
or is 67 closer to 60?or is 67 closer to 60?
70
Rounding
60 67
67 is closer to 70! 67 is closer to 70!
70
Rounding
60
2)2) How many rings is 67 away from 70?How many rings is 67 away from 70?
67 70
33
Rounding
60
77
2)2) How many rings is 67 away from 60?How many rings is 67 away from 60?
67 70
33
Rounding
60
77
67 is only 3 rings away from 70,67 is only 3 rings away from 70,but 7 rings away from 60but 7 rings away from 60
67 70
33
Rounding
60
The blue ring is The blue ring is the middle between 60 and 70.the middle between 60 and 70.
67 70
3) What side of the blue ring does 67 3) What side of the blue ring does 67 appear?appear?
Rounding
60
High sideHigh side
67 70
Rounding
60
Or Low sideOr Low side
67 70
Rounding
60
67 is on the high side67 is on the high side
67 70
Rounding
60 67
……round to 70round to 70 Therefore when rounding 67 Therefore when rounding 67
to the nearest 10…to the nearest 10…
70