Tuesday, August 31, 2010

Help, my child does not understand rounding!


ROUNDING GAMES
http://www.funbrain.com/tens/index.html


Rounding Hint:
I have students circle the number in the place they are rounding to, then underline the digit to the right. If the underlined digit is 5 or more, the circled number is increased by one. If the underlined number is less than 5, the circled number stays the same. All the numbers to the left of the circled number stay the same; the numbers to the right become zero.

Bully Numbers Hint:


If the "bully" number is 5, 6, 7, 8, or 9, then the bully "kicks" its neighbor up "one" number. If the "bully" is 1,2,3,or 4, then the neighbor gets to remain the same.

The same procedure is used for 100 and 1,000.



Rounding Rhyme

1 through 4 stay on the floor

5 through 9 climb the vine
 
 
Rounding Song: Chant the Army Chant

1,2 round down 3,4 round down---1234 round down---

5,6 round up 7,8 round up 5678 round up and 9 also.


Use a number line:

I used a number line so they could see which number the number to be rounded was closer to. This helped them see it visually. It worked for many who were not understanding why we round up for 5 and greater and down for less than 5.

EXAMPLES:

Round the following numbers to the nearest thousand.

45,657 - 46,000

1,232,001- 1,232,000

52,856 - 53,000

3,498 - 3,000

No comments:

Post a Comment