Rounding Whole Numbers (Tens and Hundreds) (Sea Animals Themed) Worksheets

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This premium worksheet bundle contains 10 activities to challenge your students and help them understand Rounding Whole Numbers (Tens and Hundreds).

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Rounding numbers is the process of making a number simpler but keeping its value close to what it was. The result is an estimated value (not the exact or actual) and is easier to understand but less accurate. 


We are rounding numbers is in our everyday lives without even realizing it. For example, your friend asks you how many pages of worksheets were you able to finish last week? You might say that you finished about 20 pages. It may be 15 or 22, but you know you finished about 20 pages, so you round to the nearest ten.

Is 12 closer to 10 or 20?
Number 12 is between 10 and 20 on the number line. As you can see, 12 is closer because it is only 2 steps away from 10 and 8 steps away from 20. So, we round down 12 to 10.

Step 1: Identify and underline the rounding digit (tens digit) to avoid confusion when rounding large numbers.

Step 2: Look at the digit in the one’s place.
Step 3: Follow the rounding rules.

  • If the digit in the ones place is 0, 1, 2, 3, or 4, you need to round down the number. To do it, copy the rounding digit.
  • If the digit in the ones place is 5, 6, 7, 8, or 9, you need to round up the number. To do it, add 1 to the rounding digit.

Step 4: Change all the digit/s to its right to zero.
Step 5: All the digit/s to the left remain the same.

Rounding Whole Numbers (Tens and Hundreds) (Sea Animals Themed) Worksheets

This is a fantastic bundle which includes everything you need to know about Rounding Whole Numbers across 21 in-depth pages. These are ready-to-use Common core aligned 3rd and 4th Grade Math worksheets.

Each ready to use worksheet collection includes 10 activities and an answer guide. Not teaching common core standards? Don’t worry! All our worksheets are completely editable so can be tailored for your curriculum and target audience.

Resource Examples

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Worksheets Activities Included

Ages 7-8 (Basic)

  • Get the Seashells
  • Round it with Crabby
  • When You Sea It
  • Round Deeper
  • Ship Explorer

Ages 8-9  (Advanced)

  • Penny Penguin
  • Jellyfishing
  • Finding Baby Shark
  • Star of the Sea
  • Ninja Saves the Turtles