This is BRILLIANT. Draw a number line with sharpie on a ziploc slider bag and use the slider as the tool to add or subtract two numbers. Awesome!

This is BRILLIANT. Draw a number line with sharpie on a ziploc slider bag and use the slider as the tool to add or subtract two numbers. Awesome!

Group work trick: Each student writes their own answer on a post-it, they bring the answers together and write a group answer in the center.

Group work trick: Each student writes their own answer on a post-it, they bring the answers together and write a group answer in the center.

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