Judge Me!: Two Hidden Ones Digits
addition · estimating and adding two two-digit numbers
To add two two-digit numbers [2.NBT.B.5].
Judge Me!: Two Hidden Ones Digits is a Grade 2 addition-estimation game where both ones digits are hidden at first. Students see the tens digits, estimate the total by combining the known tens with a reasonable guess for the unseen ones, and then calculate the exact sum after the cards are revealed. The extra hidden information makes this version more demanding than estimating with only one unknown digit.
Use it in a small group when students are ready to reason about the likely size of a two-digit sum from partial place-value information. Comparing estimates to the exact answer can lead to useful discussion about what made an estimate close. Generate teacher-ready lesson support for Judge Me!: Two Hidden Ones Digits with a free Find a Math Game account. No credit card, with 3 lifetime lesson generations.
- Grades:
- 2
- Players:
- 2–4 players
- Materials:
- cards, printable
- Classroom use:
- small group
Standards alignment
Official Rules
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