Greater Than Less Than Dolphin Activity
This greater than less than dolphin activity has 1st and 2nd grade kids sort two-digit number cards around 50 and practice the comparison signs. Answer key included.
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About this resource
Description
How to Teach Comparing Numbers
Comparing two-digit numbers starts with the tens: the number with more tens is the greater number. This Greater Than Less Than Dolphin Activity gives first and second grade students a playful way to practice that idea. Children read the number on each dolphin’s ball and decide whether it is greater than or less than 50.
Using the Dolphin Sort
Cut apart the two sort cards and the sixteen dolphin number cards. Children pick a dolphin, look at the tens digit, and place the card under Less than 50 or Greater than 50. Then they write each number in the correct box on the Dolphin Sort page and read their lists to a friend. A 1st grade comparing numbers activity practice page asks children to write the greater than or less than sign between two numbers.
What’s Included
- Colorful cover page
- How to Use teacher page
- 2 sort cards
- 16 dolphin number cards
- Dolphin Sort recording page
- 1st grade practice worksheet
- Answer keys for the sort and the practice page
Why This Activity Helps Kids
First, sorting around a benchmark number like 50 builds strong number sense. Second, looking at the tens before the ones teaches the place value thinking behind every comparison. Third, the practice page connects the hands-on sort to the greater than and less than symbols children see on tests.
Ideas for Teachers and Parents
Use the Greater Than Less Than Dolphin Activity in a math center, a small group, or as a quick ocean-themed warm-up. For an extra challenge, partners can each draw a dolphin card and race to say which number is greater. At home, families can lay out the cards and order them from least to greatest.
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