Welcome to "Ten-Box Cookie Bundler", a 1st Grade Add Tens mission at the Explorer (core) level, staged in our bakery scenario. The mission opens with a hands-on prompt: "First batch: 3 trays of 10 cookies (30 cookies). Second batch: 4 more trays of 10 (40 cookies). Build BOTH batches as ten-bundles." You'll work with the numbers 3, 10, 30 and arrive at a final answer of 80 across 3 guided steps.
Behind the bakery story, this lesson is really about add tens aligned to CCSS 1.NBT.C.4. Add multiples of 10 within 100 — when you add tens, the ones digit never changes. The key strategy this mission asks you to internalise: Adding tens is just like adding ones — but each unit is worth 10.
A general pattern to watch for in 1st Grade add tens — illustrated with example numbers below, which may differ from this lesson's: Changing the ones digit when adding tens (e.g., 23 + 10 = 34). Adding 10 only changes the tens digit. The ones stay put. Show with base-10 blocks. If you get stuck on "Ten-Box Cookie Bundler", the adaptive Socratic hints below escalate from a gentle nudge to a worked-out strategy — the same way a one-on-one tutor would coach you through it.
Grade 1 · Tensadd
Mission Progress
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Thinking Summary · 1
MasteredVisual Logic: 0 groups of 0.
[Discovery] First batch: 3 trays of 10 cookies (30 cookies). Second batch: 4 more trays of 10 (40 cookies). Build BOTH batches as ten-bundles.
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Active StepDistribute items equally among groups
1st Grade Add Tens explorer-1 representative practice page for students who need a crawlable, worked entry point into the topic without exposing every near-duplicate long-tail mission.
This explorer · core practice mission uses a equal-groups model to move from the story to a precise add tens idea. Work through the prompts in order: notice the structure first, name the quantities, then check whether the final answer fits the original situation.
In 1st Grade Add Tens, students need to connect the story, the model, and the symbolic answer. The core move here is: Adding tens is just like adding ones — but each unit is worth 10. A useful check is to ask whether the answer avoids this pitfall: Forgetting the trailing zero (e.g., 30 + 40 = 7). 3 tens + 4 tens = 7 TENS, not 7 ones. The unit must travel through the answer.
