Number And Operations In Base Ten Page 2
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4Domain: Number and Operations in Base Ten
Grade: 3
(number name), whole number, word form
Instructional Strategies Used
Resources Used
Determine the place value to which you are rounding.
Dalton, Julie. Farmers Market Rounding. Children’s Press,
2007.
Step 1: Identify the two benchmark numbers on either
side of the target number. Step 2: Find the halfway point
Arvoy, Marsha. Rounding My Path to Math. Crabtree, 2010.
between the target numbers. Step 3: Place the target
number on the number line. Step 4: Choose the
benchmark number that is closer to the target number.
What do you do if the number is at the halfway point?
rounding.html
Example: Round 453 to the nearest 10.
Step One:
450
460
Step Two:
450
455
460
Step Three:
450
453
455
460
Step Four:
450
453
455
460
Use tasks such as the following to allow students to think
deeply about rounding:
Code: 3NBT1
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Parent category: Education