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This Powerpoint will help your students to practice and master the skill of adding 10 more to a number, taking 10 away, adding 1 more and taking 1 away. Students pick a color and shade in the answer to problems on their 120 chart. 16 minutes later, they have a picture of a Christmas Tree! Directions are included in the first slide and an example of what their 120 chart should look like is at the end. I have done this with individuals, partners and groups. It's great for informal assessment