Compare Sums Without Fully Adding

How the lesson starts: Compare Sums Without Fully Adding

Pirate gem piles
Ahoy, friend! Captain Kit and Captain Lulu found gems. Who has more? Here's a secret. You don't have to add it all! Let's see how.
Same part? Skip it!
Kit has 6 gems and 7 gems. Lulu has 6 gems and 9 gems. Both have a 6. Same! So skip it. Look at 7 and 9. 9 is more. So Lulu has more!
Let's solve one
12 + 7 ? 12 + 9. Both sides have 12. Skip it! Compare 7 and 9. 7 is less. So the left side is less. Use the less-than sign. Watch out! The mouth opens to the bigger side.