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!

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!

Here's a great idea for combining a hundreds board with base-10 blocks.

Here's a great idea for combining a hundreds board with base-10 blocks.

Here's a huge set of printables for practicing fact families. These are self-correcting, fact family flash-cards.

Here's a huge set of printables for practicing fact families. These are self-correcting, fact family flash-cards.

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