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Learn to lasso numbers with an estimation round-up! Rounding and estimation are tools that can help kids add or subtract large sums quickly. And it's a skill that they can use in everyday activities.

How many men would be left if one got out of that rub-a-dub-dub tub? This nursery rhyme series has a mathematical twist. Review basic addition and subtraction with these classic children's rhymes.

When Olympic swimmer Michael Phelps won a race by .01 of a second, we saw how significant a hundredth of a second can be! This series offers practice with decimals to build a solid understanding of the place value system.